--- a/src/http/ngx_http.h
+++ b/src/http/ngx_http.h
@@ -64,7 +64,8 @@ int ngx_http_ssl_servername(ngx_ssl_conn
 #endif
 
 ngx_int_t ngx_http_parse_request_line(ngx_http_request_t *r, ngx_buf_t *b);
-ngx_int_t ngx_http_parse_complex_uri(ngx_http_request_t *r);
+ngx_int_t ngx_http_parse_complex_uri(ngx_http_request_t *r,
+    ngx_uint_t merge_slashes);
 ngx_int_t ngx_http_parse_unsafe_uri(ngx_http_request_t *r, ngx_str_t *uri,
     ngx_str_t *args, ngx_uint_t *flags);
 ngx_int_t ngx_http_parse_header_line(ngx_http_request_t *r, ngx_buf_t *b);

--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -185,6 +185,13 @@ static ngx_command_t  ngx_http_core_comm
       offsetof(ngx_http_core_srv_conf_t, ignore_invalid_headers),
       NULL },
 
+    { ngx_string("merge_slashes"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_FLAG,
+      ngx_conf_set_flag_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_core_srv_conf_t, merge_slashes),
+      NULL },
+
     { ngx_string("location"),
       NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_BLOCK|NGX_CONF_TAKE12,
       ngx_http_core_location,
@@ -2233,6 +2240,7 @@ ngx_http_core_create_srv_conf(ngx_conf_t
     cscf->client_header_buffer_size = NGX_CONF_UNSET_SIZE;
     cscf->optimize_server_names = NGX_CONF_UNSET;
     cscf->ignore_invalid_headers = NGX_CONF_UNSET;
+    cscf->merge_slashes = NGX_CONF_UNSET;
 
     return cscf;
 }
@@ -2325,6 +2333,8 @@ ngx_http_core_merge_srv_conf(ngx_conf_t 
     ngx_conf_merge_value(conf->ignore_invalid_headers,
                               prev->ignore_invalid_headers, 1);
 
+    ngx_conf_merge_value(conf->merge_slashes, prev->merge_slashes, 1);
+
     return NGX_CONF_OK;
 }
 

--- a/src/http/ngx_http_core_module.h
+++ b/src/http/ngx_http_core_module.h
@@ -143,6 +143,7 @@ typedef struct {
 
     ngx_flag_t                 optimize_server_names;
     ngx_flag_t                 ignore_invalid_headers;
+    ngx_flag_t                 merge_slashes;
 } ngx_http_core_srv_conf_t;
 
 

--- a/src/http/ngx_http_parse.c
+++ b/src/http/ngx_http_parse.c
@@ -908,7 +908,7 @@ header_done:
 
 
 ngx_int_t
-ngx_http_parse_complex_uri(ngx_http_request_t *r)
+ngx_http_parse_complex_uri(ngx_http_request_t *r, ngx_uint_t merge_slashes)
 {
     u_char  c, ch, decoded, *p, *u;
     enum {
@@ -1016,8 +1016,12 @@ ngx_http_parse_complex_uri(ngx_http_requ
             switch(ch) {
 #if (NGX_WIN32)
             case '\\':
+                break;
 #endif
             case '/':
+                if (merge_slashes) {
+                    *u++ = ch;
+                }
                 break;
             case '.':
                 state = sw_dot;

--- a/src/http/ngx_http_request.c
+++ b/src/http/ngx_http_request.c
@@ -602,10 +602,11 @@ ngx_http_ssl_servername(ngx_ssl_conn_t *
 static void
 ngx_http_process_request_line(ngx_event_t *rev)
 {
-    ssize_t              n;
-    ngx_int_t            rc, rv;
-    ngx_connection_t    *c;
-    ngx_http_request_t  *r;
+    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;
@@ -657,7 +658,9 @@ ngx_http_process_request_line(ngx_event_
                     return;
                 }
 
-                rc = ngx_http_parse_complex_uri(r);
+                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,