src/http/ngx_http_special_response.c - net/nginx-mbedtls - Rivoreo Source Code Repositories


 /*
  * Copyright (C) Igor Sysoev
  */


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


 static ngx_int_t ngx_http_send_error_page(ngx_http_request_t *r,
     ngx_http_err_page_t *err_page);
 static ngx_int_t ngx_http_send_special_response(ngx_http_request_t *r,
     ngx_http_core_loc_conf_t *clcf, ngx_uint_t err);
 static ngx_int_t ngx_http_send_refresh(ngx_http_request_t *r);


 static u_char ngx_http_error_full_tail[] =
 "<hr><center>" NGINX_VER "</center>" CRLF
 "</body>" CRLF
 "</html>" CRLF
 ;


 static u_char ngx_http_error_tail[] =
 "<hr><center>nginx</center>" CRLF
 "</body>" CRLF
 "</html>" CRLF
 ;


 static u_char ngx_http_msie_padding[] =
 "<!-- a padding to disable MSIE and Chrome friendly error page -->" CRLF
 "<!-- a padding to disable MSIE and Chrome friendly error page -->" CRLF
 "<!-- a padding to disable MSIE and Chrome friendly error page -->" CRLF
 "<!-- a padding to disable MSIE and Chrome friendly error page -->" CRLF
 "<!-- a padding to disable MSIE and Chrome friendly error page -->" CRLF
 "<!-- a padding to disable MSIE and Chrome friendly error page -->" CRLF
 ;


 static u_char ngx_http_msie_refresh_head[] =
 "<html><head><meta http-equiv=\"Refresh\" content=\"0; URL=";


 static u_char ngx_http_msie_refresh_tail[] =
 "\"></head><body></body></html>" CRLF;


 static char ngx_http_error_301_page[] =
 "<html>" CRLF
 "<head><title>301 Moved Permanently</title></head>" CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>301 Moved Permanently</h1></center>" CRLF
 ;


 static char ngx_http_error_302_page[] =
 "<html>" CRLF
 "<head><title>302 Found</title></head>" CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>302 Found</h1></center>" CRLF
 ;


 static char ngx_http_error_303_page[] =
 "<html>" CRLF
 "<head><title>303 See Other</title></head>" CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>303 See Other</h1></center>" CRLF
 ;


 static char ngx_http_error_400_page[] =
 "<html>" CRLF
 "<head><title>400 Bad Request</title></head>" CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>400 Bad Request</h1></center>" CRLF
 ;


 static char ngx_http_error_401_page[] =
 "<html>" CRLF
 "<head><title>401 Authorization Required</title></head>" CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>401 Authorization Required</h1></center>" CRLF
 ;


 static char ngx_http_error_402_page[] =
 "<html>" CRLF
 "<head><title>402 Payment Required</title></head>" CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>402 Payment Required</h1></center>" CRLF
 ;


 static char ngx_http_error_403_page[] =
 "<html>" CRLF
 "<head><title>403 Forbidden</title></head>" CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>403 Forbidden</h1></center>" CRLF
 ;


 static char ngx_http_error_404_page[] =
 "<html>" CRLF
 "<head><title>404 Not Found</title></head>" CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>404 Not Found</h1></center>" CRLF
 ;


 static char ngx_http_error_405_page[] =
 "<html>" CRLF
 "<head><title>405 Not Allowed</title></head>" CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>405 Not Allowed</h1></center>" CRLF
 ;


 static char ngx_http_error_406_page[] =
 "<html>" CRLF
 "<head><title>406 Not Acceptable</title></head>" CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>406 Not Acceptable</h1></center>" CRLF
 ;


 static char ngx_http_error_408_page[] =
 "<html>" CRLF
 "<head><title>408 Request Time-out</title></head>" CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>408 Request Time-out</h1></center>" CRLF
 ;


 static char ngx_http_error_409_page[] =
 "<html>" CRLF
 "<head><title>409 Conflict</title></head>" CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>409 Conflict</h1></center>" CRLF
 ;


 static char ngx_http_error_410_page[] =
 "<html>" CRLF
 "<head><title>410 Gone</title></head>" CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>410 Gone</h1></center>" CRLF
 ;


 static char ngx_http_error_411_page[] =
 "<html>" CRLF
 "<head><title>411 Length Required</title></head>" CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>411 Length Required</h1></center>" CRLF
 ;


 static char ngx_http_error_412_page[] =
 "<html>" CRLF
 "<head><title>412 Precondition Failed</title></head>" CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>412 Precondition Failed</h1></center>" CRLF
 ;


 static char ngx_http_error_413_page[] =
 "<html>" CRLF
 "<head><title>413 Request Entity Too Large</title></head>" CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>413 Request Entity Too Large</h1></center>" CRLF
 ;


 static char ngx_http_error_414_page[] =
 "<html>" CRLF
 "<head><title>414 Request-URI Too Large</title></head>" CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>414 Request-URI Too Large</h1></center>" CRLF
 ;


 static char ngx_http_error_415_page[] =
 "<html>" CRLF
 "<head><title>415 Unsupported Media Type</title></head>" CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>415 Unsupported Media Type</h1></center>" CRLF
 ;


 static char ngx_http_error_416_page[] =
 "<html>" CRLF
 "<head><title>416 Requested Range Not Satisfiable</title></head>" CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>416 Requested Range Not Satisfiable</h1></center>" CRLF
 ;


 static char ngx_http_error_494_page[] =
 "<html>" CRLF
 "<head><title>400 Request Header Or Cookie Too Large</title></head>"
 CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>400 Bad Request</h1></center>" CRLF
 "<center>Request Header Or Cookie Too Large</center>" CRLF
 ;


 static char ngx_http_error_495_page[] =
 "<html>" CRLF
 "<head><title>400 The SSL certificate error</title></head>"
 CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>400 Bad Request</h1></center>" CRLF
 "<center>The SSL certificate error</center>" CRLF
 ;


 static char ngx_http_error_496_page[] =
 "<html>" CRLF
 "<head><title>400 No required SSL certificate was sent</title></head>"
 CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>400 Bad Request</h1></center>" CRLF
 "<center>No required SSL certificate was sent</center>" CRLF
 ;


 static char ngx_http_error_497_page[] =
 "<html>" CRLF
 "<head><title>400 The plain HTTP request was sent to HTTPS port</title></head>"
 CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>400 Bad Request</h1></center>" CRLF
 "<center>The plain HTTP request was sent to HTTPS port</center>" CRLF
 ;


 static char ngx_http_error_500_page[] =
 "<html>" CRLF
 "<head><title>500 Internal Server Error</title></head>" CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>500 Internal Server Error</h1></center>" CRLF
 ;


 static char ngx_http_error_501_page[] =
 "<html>" CRLF
 "<head><title>501 Method Not Implemented</title></head>" CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>501 Method Not Implemented</h1></center>" CRLF
 ;


 static char ngx_http_error_502_page[] =
 "<html>" CRLF
 "<head><title>502 Bad Gateway</title></head>" CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>502 Bad Gateway</h1></center>" CRLF
 ;


 static char ngx_http_error_503_page[] =
 "<html>" CRLF
 "<head><title>503 Service Temporarily Unavailable</title></head>" CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>503 Service Temporarily Unavailable</h1></center>" CRLF
 ;


 static char ngx_http_error_504_page[] =
 "<html>" CRLF
 "<head><title>504 Gateway Time-out</title></head>" CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>504 Gateway Time-out</h1></center>" CRLF
 ;


 static char ngx_http_error_507_page[] =
 "<html>" CRLF
 "<head><title>507 Insufficient Storage</title></head>" CRLF
 "<body bgcolor=\"white\">" CRLF
 "<center><h1>507 Insufficient Storage</h1></center>" CRLF
 ;


 static ngx_str_t ngx_http_error_pages[] = {

     ngx_null_string,                     /* 201, 204 */

 #define NGX_HTTP_LAST_LEVEL_200  202
 #define NGX_HTTP_LEVEL_200       (NGX_HTTP_LAST_LEVEL_200 - 201)

     /* ngx_null_string, */               /* 300 */
     ngx_string(ngx_http_error_301_page),
     ngx_string(ngx_http_error_302_page),
     ngx_string(ngx_http_error_303_page),

 #define NGX_HTTP_LAST_LEVEL_300  304
 #define NGX_HTTP_LEVEL_300       (NGX_HTTP_LAST_LEVEL_300 - 301)

     ngx_string(ngx_http_error_400_page),
     ngx_string(ngx_http_error_401_page),
     ngx_string(ngx_http_error_402_page),
     ngx_string(ngx_http_error_403_page),
     ngx_string(ngx_http_error_404_page),
     ngx_string(ngx_http_error_405_page),
     ngx_string(ngx_http_error_406_page),
     ngx_null_string,                     /* 407 */
     ngx_string(ngx_http_error_408_page),
     ngx_string(ngx_http_error_409_page),
     ngx_string(ngx_http_error_410_page),
     ngx_string(ngx_http_error_411_page),
     ngx_string(ngx_http_error_412_page),
     ngx_string(ngx_http_error_413_page),
     ngx_string(ngx_http_error_414_page),
     ngx_string(ngx_http_error_415_page),
     ngx_string(ngx_http_error_416_page),

 #define NGX_HTTP_LAST_LEVEL_400  417
 #define NGX_HTTP_LEVEL_400       (NGX_HTTP_LAST_LEVEL_400 - 400)

     ngx_string(ngx_http_error_494_page), /* 494, request header too large */
     ngx_string(ngx_http_error_495_page), /* 495, https certificate error */
     ngx_string(ngx_http_error_496_page), /* 496, https no certificate */
     ngx_string(ngx_http_error_497_page), /* 497, http to https */
     ngx_string(ngx_http_error_404_page), /* 498, canceled */
     ngx_null_string,                     /* 499, client has closed connection */

     ngx_string(ngx_http_error_500_page),
     ngx_string(ngx_http_error_501_page),
     ngx_string(ngx_http_error_502_page),
     ngx_string(ngx_http_error_503_page),
     ngx_string(ngx_http_error_504_page),
     ngx_null_string,                     /* 505 */
     ngx_null_string,                     /* 506 */
     ngx_string(ngx_http_error_507_page)

 #define NGX_HTTP_LAST_LEVEL_500  508

 };


 static ngx_str_t  ngx_http_get_name = { 3, (u_char *) "GET " };


 ngx_int_t
 ngx_http_special_response_handler(ngx_http_request_t *r, ngx_int_t error)
 {
     ngx_uint_t                 i, err;
     ngx_http_err_page_t       *err_page;
     ngx_http_core_loc_conf_t  *clcf;

     ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                    "http special response: %d, \"%V?%V\"",
                    error, &r->uri, &r->args);

     r->err_status = error;

     if (r->keepalive) {
         switch (error) {
             case NGX_HTTP_BAD_REQUEST:
             case NGX_HTTP_REQUEST_ENTITY_TOO_LARGE:
             case NGX_HTTP_REQUEST_URI_TOO_LARGE:
             case NGX_HTTP_TO_HTTPS:
             case NGX_HTTPS_CERT_ERROR:
             case NGX_HTTPS_NO_CERT:
             case NGX_HTTP_INTERNAL_SERVER_ERROR:
                 r->keepalive = 0;
         }
     }

     if (r->lingering_close == 1) {
         switch (error) {
             case NGX_HTTP_BAD_REQUEST:
             case NGX_HTTP_TO_HTTPS:
             case NGX_HTTPS_CERT_ERROR:
             case NGX_HTTPS_NO_CERT:
                 r->lingering_close = 0;
         }
     }

     r->headers_out.content_type.len = 0;

     clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);

     if (!r->error_page && clcf->error_pages && r->uri_changes != 0) {

         if (clcf->recursive_error_pages == 0) {
             r->error_page = 1;
         }

         err_page = clcf->error_pages->elts;

         for (i = 0; i < clcf->error_pages->nelts; i++) {
             if (err_page[i].status == error) {
                 return ngx_http_send_error_page(r, &err_page[i]);
             }
         }
     }

     r->expect_tested = 1;

     if (ngx_http_discard_request_body(r) != NGX_OK) {
         error = NGX_HTTP_INTERNAL_SERVER_ERROR;
     }

     if (clcf->msie_refresh
         && r->headers_in.msie
         && (error == NGX_HTTP_MOVED_PERMANENTLY
             || error == NGX_HTTP_MOVED_TEMPORARILY))
     {
         return ngx_http_send_refresh(r);
     }

     if (error == NGX_HTTP_CREATED) {
         /* 201 */
         err = 0;
         r->header_only = 1;

     } else if (error == NGX_HTTP_NO_CONTENT) {
         /* 204 */
         err = 0;

     } else if (error >= NGX_HTTP_MOVED_PERMANENTLY
                && error < NGX_HTTP_LAST_LEVEL_300)
     {
         /* 3XX */
         err = error - NGX_HTTP_MOVED_PERMANENTLY + NGX_HTTP_LEVEL_200;

     } else if (error >= NGX_HTTP_BAD_REQUEST
                && error < NGX_HTTP_LAST_LEVEL_400)
     {
         /* 4XX */
         err = error - NGX_HTTP_BAD_REQUEST + NGX_HTTP_LEVEL_200
                                            + NGX_HTTP_LEVEL_300;

     } else if (error >= NGX_HTTP_NGINX_CODES
                && error < NGX_HTTP_LAST_LEVEL_500)
     {
         /* 49X, 5XX */
         err = error - NGX_HTTP_NGINX_CODES + NGX_HTTP_LEVEL_200
                                            + NGX_HTTP_LEVEL_300
                                            + NGX_HTTP_LEVEL_400;
         switch (error) {
             case NGX_HTTP_TO_HTTPS:
             case NGX_HTTPS_CERT_ERROR:
             case NGX_HTTPS_NO_CERT:
             case NGX_HTTP_REQUEST_HEADER_TOO_LARGE:
                 r->err_status = NGX_HTTP_BAD_REQUEST;
                 break;
         }

     } else {
         /* unknown code, zero body */
         err = 0;
     }

     return ngx_http_send_special_response(r, clcf, err);
 }


 ngx_int_t
 ngx_http_filter_finalize_request(ngx_http_request_t *r, ngx_module_t *m,
     ngx_int_t error)
 {
     void       *ctx;
     ngx_int_t   rc;

     ngx_http_clean_header(r);

     ctx = NULL;

     if (m) {
         ctx = r->ctx[m->ctx_index];
     }

     /* clear the modules contexts */
     ngx_memzero(r->ctx, sizeof(void *) * ngx_http_max_module);

     if (m) {
         r->ctx[m->ctx_index] = ctx;
     }

     r->filter_finalize = 1;

     rc = ngx_http_special_response_handler(r, error);

     /* NGX_ERROR resets any pending data */

     switch (rc) {

     case NGX_OK:
     case NGX_DONE:
         return NGX_ERROR;

     default:
         return rc;
     }
 }


 void
 ngx_http_clean_header(ngx_http_request_t *r)
 {
     ngx_memzero(&r->headers_out.status,
                 sizeof(ngx_http_headers_out_t)
                     - offsetof(ngx_http_headers_out_t, status));

     r->headers_out.headers.part.nelts = 0;
     r->headers_out.headers.part.next = NULL;
     r->headers_out.headers.last = &r->headers_out.headers.part;

     r->headers_out.content_length_n = -1;
     r->headers_out.last_modified_time = -1;
 }


 static ngx_int_t
 ngx_http_send_error_page(ngx_http_request_t *r, ngx_http_err_page_t *err_page)
 {
     ngx_int_t                  overwrite;
     ngx_str_t                  uri, args;
     ngx_table_elt_t           *location;
     ngx_http_core_loc_conf_t  *clcf;

     overwrite = err_page->overwrite;

     if (overwrite && overwrite != NGX_HTTP_OK) {
         r->expect_tested = 1;
     }

     if (overwrite >= 0) {
         r->err_status = overwrite;
     }

     if (ngx_http_complex_value(r, &err_page->value, &uri) != NGX_OK) {
         return NGX_ERROR;
     }

     if (uri.data[0] == '/') {

         if (err_page->value.lengths) {
             ngx_http_split_args(r, &uri, &args);

         } else {
             args = err_page->args;
         }

         if (r->method != NGX_HTTP_HEAD) {
             r->method = NGX_HTTP_GET;
             r->method_name = ngx_http_get_name;
         }

         return ngx_http_internal_redirect(r, &uri, &args);
     }

     if (uri.data[0] == '@') {
         return ngx_http_named_location(r, &uri);
     }

     location = ngx_list_push(&r->headers_out.headers);

     if (location == NULL) {
         return NGX_ERROR;
     }

     if (overwrite >= NGX_HTTP_MOVED_PERMANENTLY
         && overwrite <= NGX_HTTP_SEE_OTHER)
     {
         r->err_status = overwrite;

     } else {
         r->err_status = NGX_HTTP_MOVED_TEMPORARILY;
     }

     location->hash = 1;
     ngx_str_set(&location->key, "Location");
     location->value = uri;

     r->headers_out.location = location;

     clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);

     if (clcf->msie_refresh && r->headers_in.msie) {
         return ngx_http_send_refresh(r);
     }

     return ngx_http_send_special_response(r, clcf, r->err_status
                                                    - NGX_HTTP_MOVED_PERMANENTLY
                                                    + NGX_HTTP_LEVEL_200);
 }


 static ngx_int_t
 ngx_http_send_special_response(ngx_http_request_t *r,
     ngx_http_core_loc_conf_t *clcf, ngx_uint_t err)
 {
     u_char       *tail;
     size_t        len;
     ngx_int_t     rc;
     ngx_buf_t    *b;
     ngx_uint_t    msie_padding;
     ngx_chain_t   out[3];

     if (clcf->server_tokens) {
         len = sizeof(ngx_http_error_full_tail) - 1;
         tail = ngx_http_error_full_tail;

     } else {
         len = sizeof(ngx_http_error_tail) - 1;
         tail = ngx_http_error_tail;
     }

     msie_padding = 0;

     if (ngx_http_error_pages[err].len) {
         r->headers_out.content_length_n = ngx_http_error_pages[err].len + len;
         if (clcf->msie_padding
             && (r->headers_in.msie || r->headers_in.chrome)
             && r->http_version >= NGX_HTTP_VERSION_10
             && err >= NGX_HTTP_LEVEL_300)
         {
             r->headers_out.content_length_n +=
                                          sizeof(ngx_http_msie_padding) - 1;
             msie_padding = 1;
         }

         r->headers_out.content_type_len = sizeof("text/html") - 1;
         ngx_str_set(&r->headers_out.content_type, "text/html");
         r->headers_out.content_type_lowcase = NULL;

     } else {
         r->headers_out.content_length_n = -1;
     }

     if (r->headers_out.content_length) {
         r->headers_out.content_length->hash = 0;
         r->headers_out.content_length = NULL;
     }

     ngx_http_clear_accept_ranges(r);
     ngx_http_clear_last_modified(r);

     rc = ngx_http_send_header(r);

     if (rc == NGX_ERROR || r->header_only) {
         return rc;
     }

     if (ngx_http_error_pages[err].len == 0) {
         return NGX_OK;
     }

     b = ngx_calloc_buf(r->pool);
     if (b == NULL) {
         return NGX_ERROR;
     }

     b->memory = 1;
     b->pos = ngx_http_error_pages[err].data;
     b->last = ngx_http_error_pages[err].data + ngx_http_error_pages[err].len;

     out[0].buf = b;
     out[0].next = &out[1];

     b = ngx_calloc_buf(r->pool);
     if (b == NULL) {
         return NGX_ERROR;
     }

     b->memory = 1;

     b->pos = tail;
     b->last = tail + len;

     out[1].buf = b;
     out[1].next = NULL;

     if (msie_padding) {
         b = ngx_calloc_buf(r->pool);
         if (b == NULL) {
             return NGX_ERROR;
         }

         b->memory = 1;
         b->pos = ngx_http_msie_padding;
         b->last = ngx_http_msie_padding + sizeof(ngx_http_msie_padding) - 1;

         out[1].next = &out[2];
         out[2].buf = b;
         out[2].next = NULL;
     }

     if (r == r->main) {
         b->last_buf = 1;
     }

     b->last_in_chain = 1;

     return ngx_http_output_filter(r, &out[0]);
 }


 static ngx_int_t
 ngx_http_send_refresh(ngx_http_request_t *r)
 {
     u_char       *p, *location;
     size_t        len, size;
     uintptr_t     escape;
     ngx_int_t     rc;
     ngx_buf_t    *b;
     ngx_chain_t   out;

     len = r->headers_out.location->value.len;
     location = r->headers_out.location->value.data;

     escape = 2 * ngx_escape_uri(NULL, location, len, NGX_ESCAPE_REFRESH);

     size = sizeof(ngx_http_msie_refresh_head) - 1
            + escape + len
            + sizeof(ngx_http_msie_refresh_tail) - 1;

     r->err_status = NGX_HTTP_OK;

     r->headers_out.content_type_len = sizeof("text/html") - 1;
     ngx_str_set(&r->headers_out.content_type, "text/html");
     r->headers_out.content_type_lowcase = NULL;

     r->headers_out.location->hash = 0;
     r->headers_out.location = NULL;

     r->headers_out.content_length_n = size;

     if (r->headers_out.content_length) {
         r->headers_out.content_length->hash = 0;
         r->headers_out.content_length = NULL;
     }

     ngx_http_clear_accept_ranges(r);
     ngx_http_clear_last_modified(r);

     rc = ngx_http_send_header(r);

     if (rc == NGX_ERROR || r->header_only) {
         return rc;
     }

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

     p = ngx_cpymem(b->pos, ngx_http_msie_refresh_head,
                    sizeof(ngx_http_msie_refresh_head) - 1);

     if (escape == 0) {
         p = ngx_cpymem(p, location, len);

     } else {
         p = (u_char *) ngx_escape_uri(p, location, len, NGX_ESCAPE_REFRESH);
     }

     b->last = ngx_cpymem(p, ngx_http_msie_refresh_tail,
                          sizeof(ngx_http_msie_refresh_tail) - 1);

     b->last_buf = 1;
     b->last_in_chain = 1;

     out.buf = b;
     out.next = NULL;

     return ngx_http_output_filter(r, &out);
 }

	/*
	* Copyright (C) Igor Sysoev
	*/


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


	static ngx_int_t ngx_http_send_error_page(ngx_http_request_t *r,
	ngx_http_err_page_t *err_page);
	static ngx_int_t ngx_http_send_special_response(ngx_http_request_t *r,
	ngx_http_core_loc_conf_t *clcf, ngx_uint_t err);
	static ngx_int_t ngx_http_send_refresh(ngx_http_request_t *r);


	static u_char ngx_http_error_full_tail[] =
	"<hr><center>" NGINX_VER "</center>" CRLF
	"</body>" CRLF
	"</html>" CRLF
	;


	static u_char ngx_http_error_tail[] =
	"<hr><center>nginx</center>" CRLF
	"</body>" CRLF
	"</html>" CRLF
	;


	static u_char ngx_http_msie_padding[] =
	"<!-- a padding to disable MSIE and Chrome friendly error page -->" CRLF
	"<!-- a padding to disable MSIE and Chrome friendly error page -->" CRLF
	"<!-- a padding to disable MSIE and Chrome friendly error page -->" CRLF
	"<!-- a padding to disable MSIE and Chrome friendly error page -->" CRLF
	"<!-- a padding to disable MSIE and Chrome friendly error page -->" CRLF
	"<!-- a padding to disable MSIE and Chrome friendly error page -->" CRLF
	;


	static u_char ngx_http_msie_refresh_head[] =
	"<html><head><meta http-equiv=\"Refresh\" content=\"0; URL=";


	static u_char ngx_http_msie_refresh_tail[] =
	"\"></head><body></body></html>" CRLF;


	static char ngx_http_error_301_page[] =
	"<html>" CRLF
	"<head><title>301 Moved Permanently</title></head>" CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>301 Moved Permanently</h1></center>" CRLF
	;


	static char ngx_http_error_302_page[] =
	"<html>" CRLF
	"<head><title>302 Found</title></head>" CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>302 Found</h1></center>" CRLF
	;


	static char ngx_http_error_303_page[] =
	"<html>" CRLF
	"<head><title>303 See Other</title></head>" CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>303 See Other</h1></center>" CRLF
	;


	static char ngx_http_error_400_page[] =
	"<html>" CRLF
	"<head><title>400 Bad Request</title></head>" CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>400 Bad Request</h1></center>" CRLF
	;


	static char ngx_http_error_401_page[] =
	"<html>" CRLF
	"<head><title>401 Authorization Required</title></head>" CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>401 Authorization Required</h1></center>" CRLF
	;


	static char ngx_http_error_402_page[] =
	"<html>" CRLF
	"<head><title>402 Payment Required</title></head>" CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>402 Payment Required</h1></center>" CRLF
	;


	static char ngx_http_error_403_page[] =
	"<html>" CRLF
	"<head><title>403 Forbidden</title></head>" CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>403 Forbidden</h1></center>" CRLF
	;


	static char ngx_http_error_404_page[] =
	"<html>" CRLF
	"<head><title>404 Not Found</title></head>" CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>404 Not Found</h1></center>" CRLF
	;


	static char ngx_http_error_405_page[] =
	"<html>" CRLF
	"<head><title>405 Not Allowed</title></head>" CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>405 Not Allowed</h1></center>" CRLF
	;


	static char ngx_http_error_406_page[] =
	"<html>" CRLF
	"<head><title>406 Not Acceptable</title></head>" CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>406 Not Acceptable</h1></center>" CRLF
	;


	static char ngx_http_error_408_page[] =
	"<html>" CRLF
	"<head><title>408 Request Time-out</title></head>" CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>408 Request Time-out</h1></center>" CRLF
	;


	static char ngx_http_error_409_page[] =
	"<html>" CRLF
	"<head><title>409 Conflict</title></head>" CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>409 Conflict</h1></center>" CRLF
	;


	static char ngx_http_error_410_page[] =
	"<html>" CRLF
	"<head><title>410 Gone</title></head>" CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>410 Gone</h1></center>" CRLF
	;


	static char ngx_http_error_411_page[] =
	"<html>" CRLF
	"<head><title>411 Length Required</title></head>" CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>411 Length Required</h1></center>" CRLF
	;


	static char ngx_http_error_412_page[] =
	"<html>" CRLF
	"<head><title>412 Precondition Failed</title></head>" CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>412 Precondition Failed</h1></center>" CRLF
	;


	static char ngx_http_error_413_page[] =
	"<html>" CRLF
	"<head><title>413 Request Entity Too Large</title></head>" CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>413 Request Entity Too Large</h1></center>" CRLF
	;


	static char ngx_http_error_414_page[] =
	"<html>" CRLF
	"<head><title>414 Request-URI Too Large</title></head>" CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>414 Request-URI Too Large</h1></center>" CRLF
	;


	static char ngx_http_error_415_page[] =
	"<html>" CRLF
	"<head><title>415 Unsupported Media Type</title></head>" CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>415 Unsupported Media Type</h1></center>" CRLF
	;


	static char ngx_http_error_416_page[] =
	"<html>" CRLF
	"<head><title>416 Requested Range Not Satisfiable</title></head>" CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>416 Requested Range Not Satisfiable</h1></center>" CRLF
	;


	static char ngx_http_error_494_page[] =
	"<html>" CRLF
	"<head><title>400 Request Header Or Cookie Too Large</title></head>"
	CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>400 Bad Request</h1></center>" CRLF
	"<center>Request Header Or Cookie Too Large</center>" CRLF
	;


	static char ngx_http_error_495_page[] =
	"<html>" CRLF
	"<head><title>400 The SSL certificate error</title></head>"
	CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>400 Bad Request</h1></center>" CRLF
	"<center>The SSL certificate error</center>" CRLF
	;


	static char ngx_http_error_496_page[] =
	"<html>" CRLF
	"<head><title>400 No required SSL certificate was sent</title></head>"
	CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>400 Bad Request</h1></center>" CRLF
	"<center>No required SSL certificate was sent</center>" CRLF
	;


	static char ngx_http_error_497_page[] =
	"<html>" CRLF
	"<head><title>400 The plain HTTP request was sent to HTTPS port</title></head>"
	CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>400 Bad Request</h1></center>" CRLF
	"<center>The plain HTTP request was sent to HTTPS port</center>" CRLF
	;


	static char ngx_http_error_500_page[] =
	"<html>" CRLF
	"<head><title>500 Internal Server Error</title></head>" CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>500 Internal Server Error</h1></center>" CRLF
	;


	static char ngx_http_error_501_page[] =
	"<html>" CRLF
	"<head><title>501 Method Not Implemented</title></head>" CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>501 Method Not Implemented</h1></center>" CRLF
	;


	static char ngx_http_error_502_page[] =
	"<html>" CRLF
	"<head><title>502 Bad Gateway</title></head>" CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>502 Bad Gateway</h1></center>" CRLF
	;


	static char ngx_http_error_503_page[] =
	"<html>" CRLF
	"<head><title>503 Service Temporarily Unavailable</title></head>" CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>503 Service Temporarily Unavailable</h1></center>" CRLF
	;


	static char ngx_http_error_504_page[] =
	"<html>" CRLF
	"<head><title>504 Gateway Time-out</title></head>" CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>504 Gateway Time-out</h1></center>" CRLF
	;


	static char ngx_http_error_507_page[] =
	"<html>" CRLF
	"<head><title>507 Insufficient Storage</title></head>" CRLF
	"<body bgcolor=\"white\">" CRLF
	"<center><h1>507 Insufficient Storage</h1></center>" CRLF
	;


	static ngx_str_t ngx_http_error_pages[] = {

	ngx_null_string, /* 201, 204 */

	#define NGX_HTTP_LAST_LEVEL_200 202
	#define NGX_HTTP_LEVEL_200 (NGX_HTTP_LAST_LEVEL_200 - 201)

	/* ngx_null_string, / / 300 */
	ngx_string(ngx_http_error_301_page),
	ngx_string(ngx_http_error_302_page),
	ngx_string(ngx_http_error_303_page),

	#define NGX_HTTP_LAST_LEVEL_300 304
	#define NGX_HTTP_LEVEL_300 (NGX_HTTP_LAST_LEVEL_300 - 301)

	ngx_string(ngx_http_error_400_page),
	ngx_string(ngx_http_error_401_page),
	ngx_string(ngx_http_error_402_page),
	ngx_string(ngx_http_error_403_page),
	ngx_string(ngx_http_error_404_page),
	ngx_string(ngx_http_error_405_page),
	ngx_string(ngx_http_error_406_page),
	ngx_null_string, /* 407 */
	ngx_string(ngx_http_error_408_page),
	ngx_string(ngx_http_error_409_page),
	ngx_string(ngx_http_error_410_page),
	ngx_string(ngx_http_error_411_page),
	ngx_string(ngx_http_error_412_page),
	ngx_string(ngx_http_error_413_page),
	ngx_string(ngx_http_error_414_page),
	ngx_string(ngx_http_error_415_page),
	ngx_string(ngx_http_error_416_page),

	#define NGX_HTTP_LAST_LEVEL_400 417
	#define NGX_HTTP_LEVEL_400 (NGX_HTTP_LAST_LEVEL_400 - 400)

	ngx_string(ngx_http_error_494_page), /* 494, request header too large */
	ngx_string(ngx_http_error_495_page), /* 495, https certificate error */
	ngx_string(ngx_http_error_496_page), /* 496, https no certificate */
	ngx_string(ngx_http_error_497_page), /* 497, http to https */
	ngx_string(ngx_http_error_404_page), /* 498, canceled */
	ngx_null_string, /* 499, client has closed connection */

	ngx_string(ngx_http_error_500_page),
	ngx_string(ngx_http_error_501_page),
	ngx_string(ngx_http_error_502_page),
	ngx_string(ngx_http_error_503_page),
	ngx_string(ngx_http_error_504_page),
	ngx_null_string, /* 505 */
	ngx_null_string, /* 506 */
	ngx_string(ngx_http_error_507_page)

	#define NGX_HTTP_LAST_LEVEL_500 508

	};


	static ngx_str_t ngx_http_get_name = { 3, (u_char *) "GET " };


	ngx_int_t
	ngx_http_special_response_handler(ngx_http_request_t *r, ngx_int_t error)
	{
	ngx_uint_t i, err;
	ngx_http_err_page_t *err_page;
	ngx_http_core_loc_conf_t *clcf;

	ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
	"http special response: %d, \"%V?%V\"",
	error, &r->uri, &r->args);

	r->err_status = error;

	if (r->keepalive) {
	switch (error) {
	case NGX_HTTP_BAD_REQUEST:
	case NGX_HTTP_REQUEST_ENTITY_TOO_LARGE:
	case NGX_HTTP_REQUEST_URI_TOO_LARGE:
	case NGX_HTTP_TO_HTTPS:
	case NGX_HTTPS_CERT_ERROR:
	case NGX_HTTPS_NO_CERT:
	case NGX_HTTP_INTERNAL_SERVER_ERROR:
	r->keepalive = 0;
	}
	}

	if (r->lingering_close == 1) {
	switch (error) {
	case NGX_HTTP_BAD_REQUEST:
	case NGX_HTTP_TO_HTTPS:
	case NGX_HTTPS_CERT_ERROR:
	case NGX_HTTPS_NO_CERT:
	r->lingering_close = 0;
	}
	}

	r->headers_out.content_type.len = 0;

	clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);

	if (!r->error_page && clcf->error_pages && r->uri_changes != 0) {

	if (clcf->recursive_error_pages == 0) {
	r->error_page = 1;
	}

	err_page = clcf->error_pages->elts;

	for (i = 0; i < clcf->error_pages->nelts; i++) {
	if (err_page[i].status == error) {
	return ngx_http_send_error_page(r, &err_page[i]);
	}
	}
	}

	r->expect_tested = 1;

	if (ngx_http_discard_request_body(r) != NGX_OK) {
	error = NGX_HTTP_INTERNAL_SERVER_ERROR;
	}

	if (clcf->msie_refresh
	&& r->headers_in.msie
	&& (error == NGX_HTTP_MOVED_PERMANENTLY
	\|\| error == NGX_HTTP_MOVED_TEMPORARILY))
	{
	return ngx_http_send_refresh(r);
	}

	if (error == NGX_HTTP_CREATED) {
	/* 201 */
	err = 0;
	r->header_only = 1;

	} else if (error == NGX_HTTP_NO_CONTENT) {
	/* 204 */
	err = 0;

	} else if (error >= NGX_HTTP_MOVED_PERMANENTLY
	&& error < NGX_HTTP_LAST_LEVEL_300)
	{
	/* 3XX */
	err = error - NGX_HTTP_MOVED_PERMANENTLY + NGX_HTTP_LEVEL_200;

	} else if (error >= NGX_HTTP_BAD_REQUEST
	&& error < NGX_HTTP_LAST_LEVEL_400)
	{
	/* 4XX */
	err = error - NGX_HTTP_BAD_REQUEST + NGX_HTTP_LEVEL_200
	+ NGX_HTTP_LEVEL_300;

	} else if (error >= NGX_HTTP_NGINX_CODES
	&& error < NGX_HTTP_LAST_LEVEL_500)
	{
	/* 49X, 5XX */
	err = error - NGX_HTTP_NGINX_CODES + NGX_HTTP_LEVEL_200
	+ NGX_HTTP_LEVEL_300
	+ NGX_HTTP_LEVEL_400;
	switch (error) {
	case NGX_HTTP_TO_HTTPS:
	case NGX_HTTPS_CERT_ERROR:
	case NGX_HTTPS_NO_CERT:
	case NGX_HTTP_REQUEST_HEADER_TOO_LARGE:
	r->err_status = NGX_HTTP_BAD_REQUEST;
	break;
	}

	} else {
	/* unknown code, zero body */
	err = 0;
	}

	return ngx_http_send_special_response(r, clcf, err);
	}


	ngx_int_t
	ngx_http_filter_finalize_request(ngx_http_request_t r, ngx_module_t m,
	ngx_int_t error)
	{
	void *ctx;
	ngx_int_t rc;

	ngx_http_clean_header(r);

	ctx = NULL;

	if (m) {
	ctx = r->ctx[m->ctx_index];
	}

	/* clear the modules contexts */
	ngx_memzero(r->ctx, sizeof(void ) ngx_http_max_module);

	if (m) {
	r->ctx[m->ctx_index] = ctx;
	}

	r->filter_finalize = 1;

	rc = ngx_http_special_response_handler(r, error);

	/* NGX_ERROR resets any pending data */

	switch (rc) {

	case NGX_OK:
	case NGX_DONE:
	return NGX_ERROR;

	default:
	return rc;
	}
	}


	void
	ngx_http_clean_header(ngx_http_request_t *r)
	{
	ngx_memzero(&r->headers_out.status,
	sizeof(ngx_http_headers_out_t)
	- offsetof(ngx_http_headers_out_t, status));

	r->headers_out.headers.part.nelts = 0;
	r->headers_out.headers.part.next = NULL;
	r->headers_out.headers.last = &r->headers_out.headers.part;

	r->headers_out.content_length_n = -1;
	r->headers_out.last_modified_time = -1;
	}


	static ngx_int_t
	ngx_http_send_error_page(ngx_http_request_t r, ngx_http_err_page_t err_page)
	{
	ngx_int_t overwrite;
	ngx_str_t uri, args;
	ngx_table_elt_t *location;
	ngx_http_core_loc_conf_t *clcf;

	overwrite = err_page->overwrite;

	if (overwrite && overwrite != NGX_HTTP_OK) {
	r->expect_tested = 1;
	}

	if (overwrite >= 0) {
	r->err_status = overwrite;
	}

	if (ngx_http_complex_value(r, &err_page->value, &uri) != NGX_OK) {
	return NGX_ERROR;
	}

	if (uri.data[0] == '/') {

	if (err_page->value.lengths) {
	ngx_http_split_args(r, &uri, &args);

	} else {
	args = err_page->args;
	}

	if (r->method != NGX_HTTP_HEAD) {
	r->method = NGX_HTTP_GET;
	r->method_name = ngx_http_get_name;
	}

	return ngx_http_internal_redirect(r, &uri, &args);
	}

	if (uri.data[0] == '@') {
	return ngx_http_named_location(r, &uri);
	}

	location = ngx_list_push(&r->headers_out.headers);

	if (location == NULL) {
	return NGX_ERROR;
	}

	if (overwrite >= NGX_HTTP_MOVED_PERMANENTLY
	&& overwrite <= NGX_HTTP_SEE_OTHER)
	{
	r->err_status = overwrite;

	} else {
	r->err_status = NGX_HTTP_MOVED_TEMPORARILY;
	}

	location->hash = 1;
	ngx_str_set(&location->key, "Location");
	location->value = uri;

	r->headers_out.location = location;

	clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);

	if (clcf->msie_refresh && r->headers_in.msie) {
	return ngx_http_send_refresh(r);
	}

	return ngx_http_send_special_response(r, clcf, r->err_status
	- NGX_HTTP_MOVED_PERMANENTLY
	+ NGX_HTTP_LEVEL_200);
	}


	static ngx_int_t
	ngx_http_send_special_response(ngx_http_request_t *r,
	ngx_http_core_loc_conf_t *clcf, ngx_uint_t err)
	{
	u_char *tail;
	size_t len;
	ngx_int_t rc;
	ngx_buf_t *b;
	ngx_uint_t msie_padding;
	ngx_chain_t out[3];

	if (clcf->server_tokens) {
	len = sizeof(ngx_http_error_full_tail) - 1;
	tail = ngx_http_error_full_tail;

	} else {
	len = sizeof(ngx_http_error_tail) - 1;
	tail = ngx_http_error_tail;
	}

	msie_padding = 0;

	if (ngx_http_error_pages[err].len) {
	r->headers_out.content_length_n = ngx_http_error_pages[err].len + len;
	if (clcf->msie_padding
	&& (r->headers_in.msie \|\| r->headers_in.chrome)
	&& r->http_version >= NGX_HTTP_VERSION_10
	&& err >= NGX_HTTP_LEVEL_300)
	{
	r->headers_out.content_length_n +=
	sizeof(ngx_http_msie_padding) - 1;
	msie_padding = 1;
	}

	r->headers_out.content_type_len = sizeof("text/html") - 1;
	ngx_str_set(&r->headers_out.content_type, "text/html");
	r->headers_out.content_type_lowcase = NULL;

	} else {
	r->headers_out.content_length_n = -1;
	}

	if (r->headers_out.content_length) {
	r->headers_out.content_length->hash = 0;
	r->headers_out.content_length = NULL;
	}

	ngx_http_clear_accept_ranges(r);
	ngx_http_clear_last_modified(r);

	rc = ngx_http_send_header(r);

	if (rc == NGX_ERROR \|\| r->header_only) {
	return rc;
	}

	if (ngx_http_error_pages[err].len == 0) {
	return NGX_OK;
	}

	b = ngx_calloc_buf(r->pool);
	if (b == NULL) {
	return NGX_ERROR;
	}

	b->memory = 1;
	b->pos = ngx_http_error_pages[err].data;
	b->last = ngx_http_error_pages[err].data + ngx_http_error_pages[err].len;

	out[0].buf = b;
	out[0].next = &out[1];

	b = ngx_calloc_buf(r->pool);
	if (b == NULL) {
	return NGX_ERROR;
	}

	b->memory = 1;

	b->pos = tail;
	b->last = tail + len;

	out[1].buf = b;
	out[1].next = NULL;

	if (msie_padding) {
	b = ngx_calloc_buf(r->pool);
	if (b == NULL) {
	return NGX_ERROR;
	}

	b->memory = 1;
	b->pos = ngx_http_msie_padding;
	b->last = ngx_http_msie_padding + sizeof(ngx_http_msie_padding) - 1;

	out[1].next = &out[2];
	out[2].buf = b;
	out[2].next = NULL;
	}

	if (r == r->main) {
	b->last_buf = 1;
	}

	b->last_in_chain = 1;

	return ngx_http_output_filter(r, &out[0]);
	}


	static ngx_int_t
	ngx_http_send_refresh(ngx_http_request_t *r)
	{
	u_char p, location;
	size_t len, size;
	uintptr_t escape;
	ngx_int_t rc;
	ngx_buf_t *b;
	ngx_chain_t out;

	len = r->headers_out.location->value.len;
	location = r->headers_out.location->value.data;

	escape = 2 * ngx_escape_uri(NULL, location, len, NGX_ESCAPE_REFRESH);

	size = sizeof(ngx_http_msie_refresh_head) - 1
	+ escape + len
	+ sizeof(ngx_http_msie_refresh_tail) - 1;

	r->err_status = NGX_HTTP_OK;

	r->headers_out.content_type_len = sizeof("text/html") - 1;
	ngx_str_set(&r->headers_out.content_type, "text/html");
	r->headers_out.content_type_lowcase = NULL;

	r->headers_out.location->hash = 0;
	r->headers_out.location = NULL;

	r->headers_out.content_length_n = size;

	if (r->headers_out.content_length) {
	r->headers_out.content_length->hash = 0;
	r->headers_out.content_length = NULL;
	}

	ngx_http_clear_accept_ranges(r);
	ngx_http_clear_last_modified(r);

	rc = ngx_http_send_header(r);

	if (rc == NGX_ERROR \|\| r->header_only) {
	return rc;
	}

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

	p = ngx_cpymem(b->pos, ngx_http_msie_refresh_head,
	sizeof(ngx_http_msie_refresh_head) - 1);

	if (escape == 0) {
	p = ngx_cpymem(p, location, len);

	} else {
	p = (u_char *) ngx_escape_uri(p, location, len, NGX_ESCAPE_REFRESH);
	}

	b->last = ngx_cpymem(p, ngx_http_msie_refresh_tail,
	sizeof(ngx_http_msie_refresh_tail) - 1);

	b->last_buf = 1;
	b->last_in_chain = 1;

	out.buf = b;
	out.next = NULL;

	return ngx_http_output_filter(r, &out);
	}