/src/http/ngx_http_request.c

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/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>


static void ngx_http_init_request(ngx_event_t *ev);
static void ngx_http_process_request_line(ngx_event_t *rev);
static void ngx_http_process_request_headers(ngx_event_t *rev);
static ssize_t ngx_http_read_request_header(ngx_http_request_t *r);
static ngx_int_t ngx_http_alloc_large_header_buffer(ngx_http_request_t *r,
    ngx_uint_t request_line);

static ngx_int_t ngx_http_process_header_line(ngx_http_request_t *r,
    ngx_table_elt_t *h, ngx_uint_t offset);
static ngx_int_t ngx_http_process_unique_header_line(ngx_http_request_t *r,
    ngx_table_elt_t *h, ngx_uint_t offset);
static ngx_int_t ngx_http_process_host(ngx_http_request_t *r,
    ngx_table_elt_t *h, ngx_uint_t offset);
static ngx_int_t ngx_http_process_connection(ngx_http_request_t *r,
    ngx_table_elt_t *h, ngx_uint_t offset);
static ngx_int_t ngx_http_process_user_agent(ngx_http_request_t *r,
    ngx_table_elt_t *h, ngx_uint_t offset);
static ngx_int_t ngx_http_process_cookie(ngx_http_request_t *r,
    ngx_table_elt_t *h, ngx_uint_t offset);

static ngx_int_t ngx_http_process_request_header(ngx_http_request_t *r);
static void ngx_http_process_request(ngx_http_request_t *r);
static ssize_t ngx_http_validate_host(ngx_http_request_t *r, u_char **host,
    size_t len, ngx_uint_t alloc);
static ngx_int_t ngx_http_find_virtual_server(ngx_http_request_t *r,
    u_char *host, size_t len);

static void ngx_http_request_handler(ngx_event_t *ev);
static void ngx_http_terminate_request(ngx_http_request_t *r, ngx_int_t rc);
static void ngx_http_terminate_handler(ngx_http_request_t *r);
static void ngx_http_finalize_connection(ngx_http_request_t *r);
static ngx_int_t ngx_http_set_write_handler(ngx_http_request_t *r);
static void ngx_http_writer(ngx_http_request_t *r);
static void ngx_http_request_finalizer(ngx_http_request_t *r);

static void ngx_http_set_keepalive(ngx_http_request_t *r);
static void ngx_http_keepalive_handler(ngx_event_t *ev);
static void ngx_http_set_lingering_close(ngx_http_request_t *r);
static void ngx_http_lingering_close_handler(ngx_event_t *ev);
static ngx_int_t ngx_http_post_action(ngx_http_request_t *r);
static void ngx_http_close_request(ngx_http_request_t *r, ngx_int_t error);
static void ngx_http_free_request(ngx_http_request_t *r, ngx_int_t error);
static void ngx_http_log_request(ngx_http_request_t *r);
static void ngx_http_close_connection(ngx_connection_t *c);

static u_char *ngx_http_log_error(ngx_log_t *log, u_char *buf, size_t len);
static u_char *ngx_http_log_error_handler(ngx_http_request_t *r,
    ngx_http_request_t *sr, u_char *buf, size_t len);

#if (NGX_HTTP_SSL)
static void ngx_http_ssl_handshake(ngx_event_t *rev);
static void ngx_http_ssl_handshake_handler(ngx_connection_t *c);
#endif


static char *ngx_http_client_errors[] = {

    /* NGX_HTTP_PARSE_INVALID_METHOD */
    "client sent invalid method",

    /* NGX_HTTP_PARSE_INVALID_REQUEST */
    "client sent invalid request",

    /* NGX_HTTP_PARSE_INVALID_09_METHOD */
    "client sent invalid method in HTTP/0.9 request"
};


ngx_http_header_t  ngx_http_headers_in[] = {
    { ngx_string("Host"), offsetof(ngx_http_headers_in_t, host),
                 ngx_http_process_host },

    { ngx_string("Connection"), offsetof(ngx_http_headers_in_t, connection),
                 ngx_http_process_connection },

    { ngx_string("If-Modified-Since"),
                 offsetof(ngx_http_headers_in_t, if_modified_since),
                 ngx_http_process_unique_header_line },

    { ngx_string("If-Unmodified-Since"),
                 offsetof(ngx_http_headers_in_t, if_unmodified_since),
                 ngx_http_process_unique_header_line },

    { ngx_string("User-Agent"), offsetof(ngx_http_headers_in_t, user_agent),
                 ngx_http_process_user_agent },

    { ngx_string("Referer"), offsetof(ngx_http_headers_in_t, referer),
                 ngx_http_process_header_line },

    { ngx_string("Content-Length"),
                 offsetof(ngx_http_headers_in_t, content_length),
                 ngx_http_process_unique_header_line },

    { ngx_string("Content-Type"),
                 offsetof(ngx_http_headers_in_t, content_type),
                 ngx_http_process_header_line },

    { ngx_string("Range"), offsetof(ngx_http_headers_in_t, range),
                 ngx_http_process_header_line },

    { ngx_string("If-Range"),
                 offsetof(ngx_http_headers_in_t, if_range),
                 ngx_http_process_unique_header_line },

    { ngx_string("Transfer-Encoding"),
                 offsetof(ngx_http_headers_in_t, transfer_encoding),
                 ngx_http_process_header_line },

    { ngx_string("Expect"),
                 offsetof(ngx_http_headers_in_t, expect),
                 ngx_http_process_unique_header_line },

#if (NGX_HTTP_GZIP)
    { ngx_string("Accept-Encoding"),
                 offsetof(ngx_http_headers_in_t, accept_encoding),
                 ngx_http_process_header_line },

    { ngx_string("Via"), offsetof(ngx_http_headers_in_t, via),
                 ngx_http_process_header_line },
#endif

    { ngx_string("Authorization"),
                 offsetof(ngx_http_headers_in_t, authorization),
                 ngx_http_process_unique_header_line },

    { ngx_string("Keep-Alive"), offsetof(ngx_http_headers_in_t, keep_alive),
                 ngx_http_process_header_line },

#if (NGX_HTTP_X_FORWARDED_FOR)
    { ngx_string("X-Forwarded-For"),
                 offsetof(ngx_http_headers_in_t, x_forwarded_for),
                 ngx_http_process_header_line },
#endif

#if (NGX_HTTP_REALIP)
    { ngx_string("X-Real-IP"),
                 offsetof(ngx_http_headers_in_t, x_real_ip),
                 ngx_http_process_header_line },
#endif

#if (NGX_HTTP_HEADERS)
    { ngx_string("Accept"), offsetof(ngx_http_headers_in_t, accept),
                 ngx_http_process_header_line },

    { ngx_string("Accept-Language"),
                 offsetof(ngx_http_headers_in_t, accept_language),
                 ngx_http_process_header_line },
#endif

#if (NGX_HTTP_DAV)
    { ngx_string("Depth"), offsetof(ngx_http_headers_in_t, depth),
                 ngx_http_process_header_line },

    { ngx_string("Destination"), offsetof(ngx_http_headers_in_t, destination),
                 ngx_http_process_header_line },

    { ngx_string("Overwrite"), offsetof(ngx_http_headers_in_t, overwrite),
                 ngx_http_process_header_line },

    { ngx_string("Date"), offsetof(ngx_http_headers_in_t, date),
                 ngx_http_process_header_line },
#endif

    { ngx_string("Cookie"), 0, ngx_http_process_cookie },

    { ngx_null_string, 0, NULL }
};


void
ngx_http_init_connection(ngx_connection_t *c)
{
    ngx_event_t         *rev;
    ngx_http_log_ctx_t  *ctx;

    ctx = ngx_palloc(c->pool, sizeof(ngx_http_log_ctx_t));
    if (ctx == NULL) {
        ngx_http_close_connection(c);
        return;
    }

    ctx->connection = c;
    ctx->request = NULL;
    ctx->current_request = NULL;

    c->log->connection = c->number;
    c->log->handler = ngx_http_log_error;
    c->log->data = ctx;
    c->log->action = "reading client request line";

    c->log_error = NGX_ERROR_INFO;

    rev = c->read;
    rev->handler = ngx_http_init_request;
    c->write->handler = ngx_http_empty_handler;

#if (NGX_STAT_STUB)
    (void) ngx_atomic_fetch_add(ngx_stat_reading, 1);
#endif

    if (rev->ready) {
        /* the deferred accept(), rtsig, aio, iocp */

        if (ngx_use_accept_mutex) {
            ngx_post_event(rev, &ngx_posted_events);
            return;
        }

        ngx_http_init_request(rev);
        return;
    }

    ngx_add_timer(rev, c->listening->post_accept_timeout);

    if (ngx_handle_read_event(rev, 0) != NGX_OK) {
#if (NGX_STAT_STUB)
        (void) ngx_atomic_fetch_add(ngx_stat_reading, -1);
#endif
        ngx_http_close_connection(c);
        return;
    }
}


static void
ngx_http_init_request(ngx_event_t *rev)
{
    ngx_time_t                 *tp;
    ngx_uint_t                  i;
    ngx_connection_t           *c;
    ngx_http_request_t         *r;
    struct sockaddr_in         *sin;
    ngx_http_port_t            *port;
    ngx_http_in_addr_t         *addr;
    ngx_http_log_ctx_t         *ctx;
    ngx_http_addr_conf_t       *addr_conf;
    ngx_http_connection_t      *hc;
    ngx_http_core_srv_conf_t   *cscf;
    ngx_http_core_loc_conf_t   *clcf;
    ngx_http_core_main_conf_t  *cmcf;
#if (NGX_HAVE_INET6)
    struct sockaddr_in6        *sin6;
    ngx_http_in6_addr_t        *addr6;
#endif

#if (NGX_STAT_STUB)
    (void) ngx_atomic_fetch_add(ngx_stat_reading, -1);
#endif

    c = rev->data;

    if (rev->timedout) {
        ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");

        ngx_http_close_connection(c);
        return;
    }

    c->requests++;

    hc = c->data;

    if (hc == NULL) {
        hc = ngx_pcalloc(c->pool, sizeof(ngx_http_connection_t));
        if (hc == NULL) {
            ngx_http_close_connection(c);
            return;
        }
    }

    r = hc->request;

    if (r) {
        ngx_memzero(r, sizeof(ngx_http_request_t));

        r->pipeline = hc->pipeline;

        if (hc->nbusy) {
            r->header_in = hc->busy[0];
        }

    } else {
        r = ngx_pcalloc(c->pool, sizeof(ngx_http_request_t));
        if (r == NULL) {
            ngx_http_close_connection(c);
            return;
        }

        hc->request = r;
    }

    c->data = r;
    r->http_connection = hc;

    c->sent = 0;
    r->signature = NGX_HTTP_MODULE;

    /* find the server configuration for the address:port */

    port = c->listening->servers;

    r->connection = c;

    if (port->naddrs > 1) {

        /*
         * there are several addresses on this port and one of them
         * is an "*:port" wildcard so getsockname() in ngx_http_server_addr()
         * is required to determine a server address
         */

        if (ngx_connection_local_sockaddr(c, NULL, 0) != NGX_OK) {
            ngx_http_close_connection(c);
            return;
        }

        switch (c->local_sockaddr->sa_family) {

#if (NGX_HAVE_INET6)
        case AF_INET6:
            sin6 = (struct sockaddr_in6 *) c->local_sockaddr;

            addr6 = port->addrs;

            /* the last address is "*" */

            for (i = 0; i < port->naddrs - 1; i++) {
                if (ngx_memcmp(&addr6[i].addr6, &sin6->sin6_addr, 16) == 0) {
                    break;
                }
            }

            addr_conf = &addr6[i].conf;

            break;
#endif

        default: /* AF_INET */
            sin = (struct sockaddr_in *) c->local_sockaddr;

            addr = port->addrs;

            /* the last address is "*" */

            for (i = 0; i < port->naddrs - 1; i++) {
                if (addr[i].addr == sin->sin_addr.s_addr) {
                    break;
                }
            }

            addr_conf = &addr[i].conf;

            break;
        }

    } else {

        switch (c->local_sockaddr->sa_family) {

#if (NGX_HAVE_INET6)
        case AF_INET6:
            addr6 = port->addrs;
            addr_conf = &addr6[0].conf;
            break;
#endif

        default: /* AF_INET */
            addr = port->addrs;
            addr_conf = &addr[0].conf;
            break;
        }
    }

    r->virtual_names = addr_conf->virtual_names;

    /* the default server configuration for the address:port */
    cscf = addr_conf->default_server;

    r->main_conf = cscf->ctx->main_conf;
    r->srv_conf = cscf->ctx->srv_conf;
    r->loc_conf = cscf->ctx->loc_conf;

    rev->handler = ngx_http_process_request_line;
    r->read_event_handler = ngx_http_block_reading;

#if (NGX_HTTP_SSL)

    {
    ngx_http_ssl_srv_conf_t  *sscf;

    sscf = ngx_http_get_module_srv_conf(r, ngx_http_ssl_module);
    if (sscf->enable || addr_conf->ssl) {

        if (c->ssl == NULL) {

            c->log->action = "SSL handshaking";

            if (addr_conf->ssl && sscf->ssl.ctx == NULL) {
                ngx_log_error(NGX_LOG_ERR, c->log, 0,
                              "no \"ssl_certificate\" is defined "
                              "in server listening on SSL port");
                ngx_http_close_connection(c);
                return;
            }

            if (ngx_ssl_create_connection(&sscf->ssl, c, NGX_SSL_BUFFER)
                != NGX_OK)
            {
                ngx_http_close_connection(c);
                return;
            }

            rev->handler = ngx_http_ssl_handshake;
        }

        r->main_filter_need_in_memory = 1;
    }
    }

#endif

    clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
    c->log->file = clcf->error_log->file;
    if (!(c->log->log_level & NGX_LOG_DEBUG_CONNECTION)) {
        c->log->log_level = clcf->error_log->log_level;
    }

    if (c->buffer == NULL) {
        c->buffer = ngx_create_temp_buf(c->pool,
                                        cscf->client_header_buffer_size);
        if (c->buffer == NULL) {
            ngx_http_close_connection(c);
            return;
        }
    }

    if (r->header_in == NULL) {
        r->header_in = c->buffer;
    }

    r->pool = ngx_create_pool(cscf->request_pool_size, c->log);
    if (r->pool == NULL) {
        ngx_http_close_connection(c);
        return;
    }


    if (ngx_list_init(&r->headers_out.headers, r->pool, 20,
                      sizeof(ngx_table_elt_t))
        != NGX_OK)
    {
        ngx_destroy_pool(r->pool);
        ngx_http_close_connection(c);
        return;
    }

    r->ctx = ngx_pcalloc(r->pool, sizeof(void *) * ngx_http_max_module);
    if (r->ctx == NULL) {
        ngx_destroy_pool(r->pool);
        ngx_http_close_connection(c);
        return;
    }

    cmcf = ngx_http_get_module_main_conf(r, ngx_http_core_module);

    r->variables = ngx_pcalloc(r->pool, cmcf->variables.nelts
                                        * sizeof(ngx_http_variable_value_t));
    if (r->variables == NULL) {
        ngx_destroy_pool(r->pool);
        ngx_http_close_connection(c);
        return;
    }

    c->single_connection = 1;
    c->destroyed = 0;

    r->main = r;
    r->count = 1;

    tp = ngx_timeofday();
    r->start_sec = tp->sec;
    r->start_msec = tp->msec;

    r->method = NGX_HTTP_UNKNOWN;

    r->headers_in.content_length_n = -1;
    r->headers_in.keep_alive_n = -1;
    r->headers_out.content_length_n = -1;
    r->headers_out.last_modified_time = -1;

    r->uri_changes = NGX_HTTP_MAX_URI_CHANGES + 1;
    r->subrequests = NGX_HTTP_MAX_SUBREQUESTS + 1;

    r->http_state = NGX_HTTP_READING_REQUEST_STATE;

    ctx = c->log->data;
    ctx->request = r;
    ctx->current_request = r;
    r->log_handler = ngx_http_log_error_handler;

#if (NGX_STAT_STUB)
    (void) ngx_atomic_fetch_add(ngx_stat_reading, 1);
    r->stat_reading = 1;
    (void) ngx_atomic_fetch_add(ngx_stat_requests, 1);
#endif

    rev->handler(rev);
}


#if (NGX_HTTP_SSL)

static void
ngx_http_ssl_handshake(ngx_event_t *rev)
{
    u_char               buf[1];
    ssize_t              n;
    ngx_int_t            rc;
    ngx_connection_t    *c;
    ngx_http_request_t  *r;

    c = rev->data;
    r = c->data;

    ngx_log_debug0(NGX_LOG_DEBUG_HTTP, rev->log, 0,
                   "http check ssl handshake");

    if (rev->timedout) {
        ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
        c->timedout = 1;
        ngx_http_close_request(r, NGX_HTTP_REQUEST_TIME_OUT);
        return;
    }

    n = recv(c->fd, (char *) buf, 1, MSG_PEEK);

    if (n == -1 && ngx_socket_errno == NGX_EAGAIN) {

        if (!rev->timer_set) {
            ngx_add_timer(rev, c->listening->post_accept_timeout);
        }

        if (ngx_handle_read_event(rev, 0) != NGX_OK) {
            ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
        }

        return;
    }

    if (n == 1) {
        if (buf[0] & 0x80 /* SSLv2 */ || buf[0] == 0x16 /* SSLv3/TLSv1 */) {
            ngx_log_debug1(NGX_LOG_DEBUG_HTTP, rev->log, 0,
                           "https ssl handshake: 0x%02Xd", buf[0]);

            rc = ngx_ssl_handshake(c);

            if (rc == NGX_AGAIN) {

                if (!rev->timer_set) {
                    ngx_add_timer(rev, c->listening->post_accept_timeout);
                }

                c->ssl->handler = ngx_http_ssl_handshake_handler;
                return;
            }

            ngx_http_ssl_handshake_handler(c);

            return;

        } else {
            ngx_log_debug0(NGX_LOG_DEBUG_HTTP, rev->log, 0,
                           "plain http");

            r->plain_http = 1;
        }
    }

    c->log->action = "reading client request line";

    rev->handler = ngx_http_process_request_line;
    ngx_http_process_request_line(rev);
}


static void
ngx_http_ssl_handshake_handler(ngx_connection_t *c)
{
    ngx_http_request_t  *r;

    if (c->ssl->handshaked) {

        /*
         * The majority of browsers do not send the "close notify" alert.
         * Among them are MSIE, old Mozilla, Netscape 4, Konqueror,
         * and Links.  And what is more, MSIE ignores the server's alert.
         *
         * Opera and recent Mozilla send the alert.
         */

        c->ssl->no_wait_shutdown = 1;

        c->log->action = "reading client request line";

        c->read->handler = ngx_http_process_request_line;
        /* STUB: epoll edge */ c->write->handler = ngx_http_empty_handler;

        ngx_http_process_request_line(c->read);

        return;
    }

    r = c->data;

    ngx_http_close_request(r, NGX_HTTP_BAD_REQUEST);

    return;
}

#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME

int
ngx_http_ssl_servername(ngx_ssl_conn_t *ssl_conn, int *ad, void *arg)
{
    size_t                    len;
    u_char                   *host;
    const char               *servername;
    ngx_connection_t         *c;
    ngx_http_request_t       *r;
    ngx_http_ssl_srv_conf_t  *sscf;

    servername = SSL_get_servername(ssl_conn, TLSEXT_NAMETYPE_host_name);

    if (servername == NULL) {
        return SSL_TLSEXT_ERR_NOACK;
    }

    c = ngx_ssl_get_connection(ssl_conn);

    ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
                   "SSL server name: \"%s\"", servername);

    len = ngx_strlen(servername);

    if (len == 0) {
        return SSL_TLSEXT_ERR_NOACK;
    }

    r = c->data;

    host = (u_char *) servername;

    len = ngx_http_validate_host(r, &host, len, 1);

    if (len <= 0) {
        return SSL_TLSEXT_ERR_NOACK;
    }

    if (ngx_http_find_virtual_server(r, host, len) != NGX_OK) {
        return SSL_TLSEXT_ERR_NOACK;
    }

    sscf = ngx_http_get_module_srv_conf(r, ngx_http_ssl_module);

    if (sscf->ssl.ctx) {
        SSL_set_SSL_CTX(ssl_conn, sscf->ssl.ctx);

        /*
         * SSL_set_SSL_CTX() only changes certs as of 1.0.0d
         * adjust other things we care about
         */

        SSL_set_verify(ssl_conn, SSL_CTX_get_verify_mode(sscf->ssl.ctx),
                       SSL_CTX_get_verify_callback(sscf->ssl.ctx));

        SSL_set_verify_depth(ssl_conn, SSL_CTX_get_verify_depth(sscf->ssl.ctx));

#ifdef SSL_CTRL_CLEAR_OPTIONS
        /* only in 0.9.8m+ */
        SSL_clear_options(ssl_conn, SSL_get_options(ssl_conn) &
                                    ~SSL_CTX_get_options(sscf->ssl.ctx));
#endif

        SSL_set_options(ssl_conn, SSL_CTX_get_options(sscf->ssl.ctx));
    }

    return SSL_TLSEXT_ERR_OK;
}

#endif

#endif


static void
ngx_http_process_request_line(ngx_event_t *rev)
{
    u_char                    *host;
    ssize_t                    n;
    ngx_int_t                  rc, rv;
    ngx_connection_t          *c;
    ngx_http_request_t        *r;
    ngx_http_core_srv_conf_t  *cscf;

    c = rev->data;
    r = c->data;

    ngx_log_debug0(NGX_LOG_DEBUG_HTTP, rev->log, 0,
                   "http process request line");

    if (rev->timedout) {
        ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
        c->timedout = 1;
        ngx_http_close_request(r, NGX_HTTP_REQUEST_TIME_OUT);
        return;
    }

    rc = NGX_AGAIN;

    for ( ;; ) {

        if (rc == NGX_AGAIN) {
            n = ngx_http_read_request_header(r);

            if (n == NGX_AGAIN || n == NGX_ERROR) {
                return;
            }
        }

        rc = ngx_http_parse_request_line(r, r->header_in);

        if (rc == NGX_OK) {

            /* the request line has been parsed successfully */

            r->request_line.len = r->request_end - r->request_start;
            r->request_line.data = r->request_start;


            if (r->args_start) {
                r->uri.len = r->args_start - 1 - r->uri_start;
            } else {
                r->uri.len = r->uri_end - r->uri_start;
            }


            if (r->complex_uri || r->quoted_uri) {

                r->uri.data = ngx_pnalloc(r->pool, r->uri.len + 1);
                if (r->uri.data == NULL) {
                    ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
                    return;
                }

                cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module);

                rc = ngx_http_parse_complex_uri(r, cscf->merge_slashes);

                if (rc == NGX_HTTP_PARSE_INVALID_REQUEST) {
                    ngx_log_error(NGX_LOG_INFO, c->log, 0,
                                  "client sent invalid request");
                    ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST);
                    return;
                }

            } else {
                r->uri.data = r->uri_start;
            }


            r->unparsed_uri.len = r->uri_end - r->uri_start;
            r->unparsed_uri.data = r->uri_start;

            r->valid_unparsed_uri = r->space_in_uri ? 0 : 1;

            r->method_name.len = r->method_end - r->request_start + 1;
            r->method_name.data = r->request_line.data;


            if (r->http_protocol.data) {
                r->http_protocol.len = r->request_end - r->http_protocol.data;
            }


            if (r->uri_ext) {
                if (r->args_start) {
                    r->exten.len = r->args_start - 1 - r->uri_ext;
                } else {
                    r->exten.len = r->uri_end - r->uri_ext;
                }

                r->exten.data = r->uri_ext;
            }


            if (r->args_start && r->uri_end > r->args_start) {
                r->args.len = r->uri_end - r->args_start;
                r->args.data = r->args_start;
            }

#if (NGX_WIN32)
            {
            u_char  *p, *last;

            p = r->uri.data;
            last = r->uri.data + r->uri.len;

            while (p < last) {

                if (*p++ == ':') {

                    /*
                     * this check covers "::$data", "::$index_allocation" and
                     * ":$i30:$index_allocation"
                     */

                    if (p < last && *p == '$') {
                        ngx_log_error(NGX_LOG_INFO, c->log, 0,
                                      "client sent unsafe win32 URI");
                        ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST);
                        return;
                    }
                }
            }

            p = r->uri.data + r->uri.len - 1;

            while (p > r->uri.data) {

                if (*p == ' ') {
                    p--;
                    continue;
                }

                if (*p == '.') {
                    p--;
                    continue;
                }

                break;
            }

            if (p != r->uri.data + r->uri.len - 1) {
                r->uri.len = p + 1 - r->uri.data;
                ngx_http_set_exten(r);
            }

            }
#endif

            ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
                           "http request line: \"%V\"", &r->request_line);

            ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
                           "http uri: \"%V\"", &r->uri);

            ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
                           "http args: \"%V\"", &r->args);

            ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
                           "http exten: \"%V\"", &r->exten);

            if (r->host_start && r->host_end) {

                host = r->host_start;
                n = ngx_http_validate_host(r, &host,
                                           r->host_end - r->host_start, 0);

                if (n == 0) {
                    ngx_log_error(NGX_LOG_INFO, c->log, 0,
                                  "client sent invalid host in request line");
                    ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST);
                    return;
                }

                if (n < 0) {
                    ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
                    return;
                }

                r->headers_in.server.len = n;
                r->headers_in.server.data = host;
            }

            if (r->http_version < NGX_HTTP_VERSION_10) {

                if (ngx_http_find_virtual_server(r, r->headers_in.server.data,
                                                 r->headers_in.server.len)
                    == NGX_ERROR)
                {
                    ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
                    return;
                }

                ngx_http_process_request(r);
                return;
            }


            if (ngx_list_init(&r->headers_in.headers, r->pool, 20,
                              sizeof(ngx_table_elt_t))
                != NGX_OK)
            {
                ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
                return;
            }


            if (ngx_array_init(&r->headers_in.cookies, r->pool, 2,
                               sizeof(ngx_table_elt_t *))
                != NGX_OK)
            {
                ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
                return;
            }

            c->log->action = "reading client request headers";

            rev->handler = ngx_http_process_request_headers;
            ngx_http_process_request_headers(rev);

            return;
        }

        if (rc != NGX_AGAIN) {

            /* there was error while a request line parsing */

            ngx_log_error(NGX_LOG_INFO, c->log, 0,
                          ngx_http_client_errors[rc - NGX_HTTP_CLIENT_ERROR]);
            ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST);
            return;
        }

        /* NGX_AGAIN: a request line parsing is still incomplete */

        if (r->header_in->pos == r->header_in->end) {

            rv = ngx_http_alloc_large_header_buffer(r, 1);

            if (rv == NGX_ERROR) {
                ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
                return;
            }

            if (rv == NGX_DECLINED) {
                r->request_line.len = r->header_in->end - r->request_start;
                r->request_line.data = r->request_start;

                ngx_log_error(NGX_LOG_INFO, c->log, 0,
                              "client sent too long URI");
                ngx_http_finalize_request(r, NGX_HTTP_REQUEST_URI_TOO_LARGE);
                return;
            }
        }
    }
}


static void
ngx_http_process_request_headers(ngx_event_t *rev)
{
    u_char                     *p;
    size_t                      len;
    ssize_t                     n;
    ngx_int_t                   rc, rv;
    ngx_table_elt_t            *h;
    ngx_connection_t           *c;
    ngx_http_header_t          *hh;
    ngx_http_request_t         *r;
    ngx_http_core_srv_conf_t   *cscf;
    ngx_http_core_main_conf_t  *cmcf;

    c = rev->data;
    r = c->data;

    ngx_log_debug0(NGX_LOG_DEBUG_HTTP, rev->log, 0,
                   "http process request header line");

    if (rev->timedout) {
        ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
        c->timedout = 1;
        ngx_http_close_request(r, NGX_HTTP_REQUEST_TIME_OUT);
        return;
    }

    cmcf = ngx_http_get_module_main_conf(r, ngx_http_core_module);
    cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module);

    rc = NGX_AGAIN;

    for ( ;; ) {

        if (rc == NGX_AGAIN) {

            if (r->header_in->pos == r->header_in->end) {

                rv = ngx_http_alloc_large_header_buffer(r, 0);

                if (rv == NGX_ERROR) {
                    ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
                    return;
                }

                if (rv == NGX_DECLINED) {
                    p = r->header_name_start;

                    r->lingering_close = 1;

                    if (p == NULL) {
                        ngx_log_error(NGX_LOG_INFO, c->log, 0,
                                      "client sent too large request");
                        ngx_http_finalize_request(r,
                                            NGX_HTTP_REQUEST_HEADER_TOO_LARGE);
                        return;
                    }

                    len = r->header_in->end - p;

                    if (len > NGX_MAX_ERROR_STR - 300) {
                        len = NGX_MAX_ERROR_STR - 300;
                        p[len++] = '.'; p[len++] = '.'; p[len++] = '.';
                    }

                    ngx_log_error(NGX_LOG_INFO, c->log, 0,
                                  "client sent too long header line: \"%*s\"",
                                  len, r->header_name_start);

                    ngx_http_finalize_request(r,
                                            NGX_HTTP_REQUEST_HEADER_TOO_LARGE);
                    return;
                }
            }

            n = ngx_http_read_request_header(r);

            if (n == NGX_AGAIN || n == NGX_ERROR) {
                return;
            }
        }

        rc = ngx_http_parse_header_line(r, r->header_in,
                                        cscf->underscores_in_headers);

        if (rc == NGX_OK) {

            if (r->invalid_header && cscf->ignore_invalid_headers) {

                /* there was error while a header line parsing */

                ngx_log_error(NGX_LOG_INFO, c->log, 0,
                              "client sent invalid header line: \"%*s\"",
                              r->header_end - r->header_name_start,
                              r->header_name_start);
                continue;
            }

            /* a header line has been parsed successfully */

            h = ngx_list_push(&r->headers_in.headers);
            if (h == NULL) {
                ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
                return;
            }

            h->hash = r->header_hash;

            h->key.len = r->header_name_end - r->header_name_start;
            h->key.data = r->header_name_start;
            h->key.data[h->key.len] = '\0';

            h->value.len = r->header_end - r->header_start;
            h->value.data = r->header_start;
            h->value.data[h->value.len] = '\0';

            h->lowcase_key = ngx_pnalloc(r->pool, h->key.len);
            if (h->lowcase_key == NULL) {
                ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
                return;
            }

            if (h->key.len == r->lowcase_index) {
                ngx_memcpy(h->lowcase_key, r->lowcase_header, h->key.len);

            } else {
                ngx_strlow(h->lowcase_key, h->key.data, h->key.len);
            }

            hh = ngx_hash_find(&cmcf->headers_in_hash, h->hash,
                               h->lowcase_key, h->key.len);

            if (hh && hh->handler(r, h, hh->offset) != NGX_OK) {
                return;
            }

            ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                           "http header: \"%V: %V\"",
                           &h->key, &h->value);

            continue;
        }

        if (rc == NGX_HTTP_PARSE_HEADER_DONE) {

            /* a whole header has been parsed successfully */

            ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                           "http header done");

            r->request_length += r->header_in->pos - r->header_in->start;

            r->http_state = NGX_HTTP_PROCESS_REQUEST_STATE;

            rc = ngx_http_process_request_header(r);

            if (rc != NGX_OK) {
                return;
            }

            ngx_http_process_request(r);

            return;
        }

        if (rc == NGX_AGAIN) {

            /* a header line parsing is still not complete */

            continue;
        }

        /* rc == NGX_HTTP_PARSE_INVALID_HEADER: "\r" is not followed by "\n" */

        ngx_log_error(NGX_LOG_INFO, c->log, 0,
                      "client sent invalid header line: \"%*s\\r...\"",
                      r->header_end - r->header_name_start,
                      r->header_name_start);
        ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST);
        return;
    }
}


static ssize_t
ngx_http_read_request_header(ngx_http_request_t *r)
{
    ssize_t                    n;
    ngx_event_t               *rev;
    ngx_connection_t          *c;
    ngx_http_core_srv_conf_t  *cscf;

    c = r->connection;
    rev = c->read;

    n = r->header_in->last - r->header_in->pos;

    if (n > 0) {
        return n;
    }

    if (rev->ready) {
        n = c->recv(c, r->header_in->last,
                    r->header_in->end - r->header_in->last);
    } else {
        n = NGX_AGAIN;
    }

    if (n == NGX_AGAIN) {
        if (!rev->timer_set) {
            cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module);
            ngx_add_timer(rev, cscf->client_header_timeout);
        }

        if (ngx_handle_read_event(rev, 0) != NGX_OK) {
            ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
            return NGX_ERROR;
        }

        return NGX_AGAIN;
    }

    if (n == 0) {
        ngx_log_error(NGX_LOG_INFO, c->log, 0,
                      "client prematurely closed connection");
    }

    if (n == 0 || n == NGX_ERROR) {
        c->error = 1;
        c->log->action = "reading client request headers";

        ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST);
        return NGX_ERROR;
    }

    r->header_in->last += n;

    return n;
}


static ngx_int_t
ngx_http_alloc_large_header_buffer(ngx_http_request_t *r,
    ngx_uint_t request_line)
{
    u_char                    *old, *new;
    ngx_buf_t                 *b;
    ngx_http_connection_t     *hc;
    ngx_http_core_srv_conf_t  *cscf;

    ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                   "http alloc large header buffer");

    if (request_line && r->state == 0) {

        /* the client fills up the buffer with "\r\n" */

        r->request_length += r->header_in->end - r->header_in->start;

        r->header_in->pos = r->header_in->start;
        r->header_in->last = r->header_in->start;

        return NGX_OK;
    }

    old = request_line ? r->request_start : r->header_name_start;

    cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module);

    if (r->state != 0
        && (size_t) (r->header_in->pos - old)
                                     >= cscf->large_client_header_buffers.size)
    {
        return NGX_DECLINED;
    }

    hc = r->http_connection;

    if (hc->nfree) {
        b = hc->free[--hc->nfree];

        ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                       "http large header free: %p %uz",
                       b->pos, b->end - b->last);

    } else if (hc->nbusy < cscf->large_client_header_buffers.num) {

        if (hc->busy == NULL) {
            hc->busy = ngx_palloc(r->connection->pool,
                  cscf->large_client_header_buffers.num * sizeof(ngx_buf_t *));
            if (hc->busy == NULL) {
                return NGX_ERROR;
            }
        }

        b = ngx_create_temp_buf(r->connection->pool,
                                cscf->large_client_header_buffers.size);
        if (b == NULL) {
            return NGX_ERROR;
        }

        ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                       "http large header alloc: %p %uz",
                       b->pos, b->end - b->last);

    } else {
        return NGX_DECLINED;
    }

    hc->busy[hc->nbusy++] = b;

    if (r->state == 0) {
        /*
         * r->state == 0 means that a header line was parsed successfully
         * and we do not need to copy incomplete header line and
         * to relocate the parser header pointers
         */

        r->request_length += r->header_in->end - r->header_in->start;

        r->header_in = b;

        return NGX_OK;
    }

    ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                   "http large header copy: %d", r->header_in->pos - old);

    r->request_length += old - r->header_in->start;

    new = b->start;

    ngx_memcpy(new, old, r->header_in->pos - old);

    b->pos = new + (r->header_in->pos - old);
    b->last = new + (r->header_in->pos - old);

    if (request_line) {
        r->request_start = new;

        if (r->request_end) {
            r->request_end = new + (r->request_end - old);
        }

        r->method_end = new + (r->method_end - old);

        r->uri_start = new + (r->uri_start - old);
        r->uri_end = new + (r->uri_end - old);

        if (r->schema_start) {
            r->schema_start = new + (r->schema_start - old);
            r->schema_end = new + (r->schema_end - old);
        }

        if (r->host_start) {
            r->host_start = new + (r->host_start - old);
            if (r->host_end) {
                r->host_end = new + (r->host_end - old);
            }
        }

        if (r->port_start) {
            r->port_start = new + (r->port_start - old);
            r->port_end = new + (r->port_end - old);
        }

        if (r->uri_ext) {
            r->uri_ext = new + (r->uri_ext - old);
        }

        if (r->args_start) {
            r->args_start = new + (r->args_start - old);
        }

        if (r->http_protocol.data) {
            r->http_protocol.data = new + (r->http_protocol.data - old);
        }

    } else {
        r->header_name_start = new;
        r->header_name_end = new + (r->header_name_end - old);
        r->header_start = new + (r->header_start - old);
        r->header_end = new + (r->header_end - old);
    }

    r->header_in = b;

    return NGX_OK;
}


static ngx_int_t
ngx_http_process_header_line(ngx_http_request_t *r, ngx_table_elt_t *h,
    ngx_uint_t offset)
{
    ngx_table_elt_t  **ph;

    ph = (ngx_table_elt_t **) ((char *) &r->headers_in + offset);

    if (*ph == NULL) {
        *ph = h;
    }

    return NGX_OK;
}


static ngx_int_t
ngx_http_process_unique_header_line(ngx_http_request_t *r, ngx_table_elt_t *h,
    ngx_uint_t offset)
{
    ngx_table_elt_t  **ph;

    ph = (ngx_table_elt_t **) ((char *) &r->headers_in + offset);

    if (*ph == NULL) {
        *ph = h;
        return NGX_OK;
    }

    ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
                  "client sent duplicate header line: \"%V: %V\", "
                  "previous value: \"%V: %V\"",
                  &h->key, &h->value, &(*ph)->key, &(*ph)->value);

    ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST);

    return NGX_ERROR;
}


static ngx_int_t
ngx_http_process_host(ngx_http_request_t *r, ngx_table_elt_t *h,
    ngx_uint_t offset)
{
    u_char   *host;
    ssize_t   len;

    if (r->headers_in.host == NULL) {
        r->headers_in.host = h;
    }

    host = h->value.data;
    len = ngx_http_validate_host(r, &host, h->value.len, 0);

    if (len == 0) {
        ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
                      "client sent invalid host header");
        ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST);
        return NGX_ERROR;
    }

    if (len < 0) {
        ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
        return NGX_ERROR;
    }

    if (r->headers_in.server.len) {
        return NGX_OK;
    }

    r->headers_in.server.len = len;
    r->headers_in.server.data = host;

    return NGX_OK;
}


static ngx_int_t
ngx_http_process_connection(ngx_http_request_t *r, ngx_table_elt_t *h,
    ngx_uint_t offset)
{
    if (ngx_strcasestrn(h->value.data, "close", 5 - 1)) {
        r->headers_in.connection_type = NGX_HTTP_CONNECTION_CLOSE;

    } else if (ngx_strcasestrn(h->value.data, "keep-alive", 10 - 1)) {
        r->headers_in.connection_type = NGX_HTTP_CONNECTION_KEEP_ALIVE;
    }

    return NGX_OK;
}


static ngx_int_t
ngx_http_process_user_agent(ngx_http_request_t *r, ngx_table_elt_t *h,
    ngx_uint_t offset)
{
    u_char  *user_agent, *msie;

    if (r->headers_in.user_agent) {
        return NGX_OK;
    }

    r->headers_in.user_agent = h;

    /* check some widespread browsers while the header is in CPU cache */

    user_agent = h->value.data;

    msie = ngx_strstrn(user_agent, "MSIE ", 5 - 1);

    if (msie && msie + 7 < user_agent + h->value.len) {

        r->headers_in.msie = 1;

        if (msie[6] == '.') {

            switch (msie[5]) {
            case '4':
            case '5':
                r->headers_in.msie6 = 1;
                break;
            case '6':
                if (ngx_strstrn(msie + 8, "SV1", 3 - 1) == NULL) {
                    r->headers_in.msie6 = 1;
                }
                break;
            }
        }

#if 0
        /* MSIE ignores the SSL "close notify" alert */
        if (c->ssl) {
            c->ssl->no_send_shutdown = 1;
        }
#endif
    }

    if (ngx_strstrn(user_agent, "Opera", 5 - 1)) {
        r->headers_in.opera = 1;
        r->headers_in.msie = 0;
        r->headers_in.msie6 = 0;
    }

    if (!r->headers_in.msie && !r->headers_in.opera) {

        if (ngx_strstrn(user_agent, "Gecko/", 6 - 1)) {
            r->headers_in.gecko = 1;

        } else if (ngx_strstrn(user_agent, "Chrome/", 7 - 1)) {
            r->headers_in.chrome = 1;

        } else if (ngx_strstrn(user_agent, "Safari/", 7 - 1)
                   && ngx_strstrn(user_agent, "Mac OS X", 8 - 1))
        {
            r->headers_in.safari = 1;

        } else if (ngx_strstrn(user_agent, "Konqueror", 9 - 1)) {
            r->headers_in.konqueror = 1;
        }
    }

    return NGX_OK;
}


static ngx_int_t
ngx_http_process_cookie(ngx_http_request_t *r, ngx_table_elt_t *h,
    ngx_uint_t offset)
{
    ngx_table_elt_t  **cookie;

    cookie = ngx_array_push(&r->headers_in.cookies);
    if (cookie) {
        *cookie = h;
        return NGX_OK;
    }

    ngx_http_close_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);

    return NGX_ERROR;
}


static ngx_int_t
ngx_http_process_request_header(ngx_http_request_t *r)
{
    if (ngx_http_find_virtual_server(r, r->headers_in.server.data,
                                     r->headers_in.server.len)
        == NGX_ERROR)
    {
        ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
        return NGX_ERROR;
    }

    if (r->headers_in.host == NULL && r->http_version > NGX_HTTP_VERSION_10) {
        ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
                   "client sent HTTP/1.1 request without \"Host\" header");
        ngx_http_finalize_request(r, NGX_HTTP_BAD_REQUEST);
        return NGX_ERROR;
    }

    if (r->headers_in.content_length) {
        r->headers_in.content_length_n =
                            ngx_atoof(r->headers_in.content_length->value.data,
                                      r->headers_in.content_length->value.len);

        if (r->headers_in.content_length_n == NGX_ERROR) {
            ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
                          "client sent invalid \"Content-Length\" header");
            ngx_http_finalize_request(r, NGX_HTTP_LENGTH_REQUIRED);
            return NGX_ERROR;
        }
    }

    if (r->method & NGX_HTTP_PUT && r->headers_in.content_length_n == -1) {
        ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
                  "client sent %V method without \"Content-Length\" header",
                  &r->method_name);
        ngx_http_finalize_request(r, NGX_HTTP_LENGTH_REQUIRED);
        return NGX_ERROR;
    }

    if (r->method & NGX_HTTP_TRACE) {
        ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
                      "client sent TRACE method");
        ngx_http_finalize_request(r, NGX_HTTP_NOT_ALLOWED);
        return NGX_ERROR;
    }

    if (r->headers_in.transfer_encoding
        && ngx_strcasestrn(r->headers_in.transfer_encoding->value.data,
                           "chunked", 7 - 1))
    {
        ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
                      "client sent \"Transfer-Encoding: chunked\" header");
        ngx_http_finalize_request(r, NGX_HTTP_LENGTH_REQUIRED);
        return NGX_ERROR;
    }

    if (r->headers_in.connection_type == NGX_HTTP_CONNECTION_KEEP_ALIVE) {
        if (r->headers_in.keep_alive) {
            r->headers_in.keep_alive_n =
                            ngx_atotm(r->headers_in.keep_alive->value.data,
                                      r->headers_in.keep_alive->value.len);
        }
    }

    return NGX_OK;
}


static void
ngx_http_process_request(ngx_http_request_t *r)
{
    ngx_connection_t  *c;

    c = r->connection;

    if (r->plain_http) {
        ngx_log_error(NGX_LOG_INFO, c->log, 0,
                      "client sent plain HTTP request to HTTPS port");
        ngx_http_finalize_request(r, NGX_HTTP_TO_HTTPS);
        return;
    }

#if (NGX_HTTP_SSL)

    if (c->ssl) {
        long                      rc;
        X509                     *cert;
        ngx_http_ssl_srv_conf_t  *sscf;

        sscf = ngx_http_get_module_srv_conf(r, ngx_http_ssl_module);

        if (sscf->verify) {
            rc = SSL_get_verify_result(c->ssl->connection);

            if (rc != X509_V_OK) {
                ngx_log_error(NGX_LOG_INFO, c->log, 0,
                              "client SSL certificate verify error: (%l:%s)",
                              rc, X509_verify_cert_error_string(rc));

                ngx_ssl_remove_cached_session(sscf->ssl.ctx,
                                       (SSL_get0_session(c->ssl->connection)));

                ngx_http_finalize_request(r, NGX_HTTPS_CERT_ERROR);
                return;
            }

            if (sscf->verify == 1) {
                cert = SSL_get_peer_certificate(c->ssl->connection);

                if (cert == NULL) {
                    ngx_log_error(NGX_LOG_INFO, c->log, 0,
                                  "client sent no required SSL certificate");

                    ngx_ssl_remove_cached_session(sscf->ssl.ctx,
                                       (SSL_get0_session(c->ssl->connection)));

                    ngx_http_finalize_request(r, NGX_HTTPS_NO_CERT);
                    return;
                }

                X509_free(cert);
            }
        }
    }

#endif

    if (c->read->timer_set) {
        ngx_del_timer(c->read);
    }

#if (NGX_STAT_STUB)
    (void) ngx_atomic_fetch_add(ngx_stat_reading, -1);
    r->stat_reading = 0;
    (void) ngx_atomic_fetch_add(ngx_stat_writing, 1);
    r->stat_writing = 1;
#endif

    c->read->handler = ngx_http_request_handler;
    c->write->handler = ngx_http_request_handler;
    r->read_event_handler = ngx_http_block_reading;

    ngx_http_handler(r);

    ngx_http_run_posted_requests(c);
}


static ssize_t
ngx_http_validate_host(ngx_http_request_t *r, u_char **host, size_t len,
    ngx_uint_t alloc)
{
    u_char  *h, ch;
    size_t   i, dot_pos, host_len;

    enum {
        sw_usual = 0,
        sw_literal,
        sw_rest
    } state;

    dot_pos = len;
    host_len = len;

    h = *host;

    state = sw_usual;

    for (i = 0; i < len; i++) {
        ch = h[i];

        switch (ch) {

        case '.':
            if (dot_pos == i - 1) {
                return 0;
            }
            dot_pos = i;
            break;

        case ':':
            if (state == sw_usual) {
                host_len = i;
                state = sw_rest;
            }
            break;

        case '[':
            if (i == 0) {
                state = sw_literal;
            }
            break;

        case ']':
            if (state == sw_literal) {
                host_len = i + 1;
                state = sw_rest;
            }
            break;

        case '\0':
            return 0;

        default:

            if (ngx_path_separator(ch)) {
                return 0;
            }

            if (ch >= 'A' && ch <= 'Z') {
                alloc = 1;
            }

            break;
        }
    }

    if (dot_pos == host_len - 1) {
        host_len--;
    }

    if (alloc) {
        *host = ngx_pnalloc(r->pool, host_len);
        if (*host == NULL) {
            return -1;
        }

        ngx_strlow(*host, h, host_len);
    }

    return host_len;
}


static ngx_int_t
ngx_http_find_virtual_server(ngx_http_request_t *r, u_char *host, size_t len)
{
    ngx_http_core_loc_conf_t  *clcf;
    ngx_http_core_srv_conf_t  *cscf;

    if (r->virtual_names == NULL) {
        return NGX_DECLINED;
    }

    cscf = ngx_hash_find_combined(&r->virtual_names->names,
                                  ngx_hash_key(host, len), host, len);

    if (cscf) {
        goto found;
    }

#if (NGX_PCRE)

    if (len && r->virtual_names->nregex) {
        ngx_int_t                n;
        ngx_uint_t               i;
        ngx_str_t                name;
        ngx_http_server_name_t  *sn;

        name.len = len;
        name.data = host;

        sn = r->virtual_names->regex;

        for (i = 0; i < r->virtual_names->nregex; i++) {

            n = ngx_http_regex_exec(r, sn[i].regex, &name);

            if (n == NGX_OK) {
                cs…