diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
index fd31253..8b82638 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -911,7 +911,7 @@
         loc_len = (r->valid_location && ctx->vars.uri.len) ?
                       plcf->location.len : 0;
 
-        if (r->quoted_uri || r->internal) {
+        if (r->quoted_uri || r->space_in_uri || r->internal) {
             escape = 2 * ngx_escape_uri(NULL, r->uri.data + loc_len,
                                         r->uri.len - loc_len, NGX_ESCAPE_URI);
         }
diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
index d89342f..d0760f4 100644
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -824,10 +824,6 @@
         r->phase_handler = cmcf->phase_engine.server_rewrite_index;
     }
 
-    if (r->unparsed_uri.len) {
-        r->valid_unparsed_uri = 1;
-    }
-
     r->valid_location = 1;
 #if (NGX_HTTP_GZIP)
     r->gzip_tested = 0;
diff --git a/src/http/ngx_http_parse.c b/src/http/ngx_http_parse.c
index 96b3135..6facc82 100644
--- a/src/http/ngx_http_parse.c
+++ b/src/http/ngx_http_parse.c
@@ -112,8 +112,10 @@
         sw_schema_slash_slash,
         sw_host,
         sw_port,
+        sw_host_http_09,
         sw_after_slash_in_uri,
         sw_check_uri,
+        sw_check_uri_http_09,
         sw_uri,
         sw_http_09,
         sw_http_H,
@@ -357,7 +359,7 @@
                  */
                 r->uri_start = r->schema_end + 1;
                 r->uri_end = r->schema_end + 2;
-                state = sw_http_09;
+                state = sw_host_http_09;
                 break;
             default:
                 return NGX_HTTP_PARSE_INVALID_REQUEST;
@@ -383,13 +385,35 @@
                  */
                 r->uri_start = r->schema_end + 1;
                 r->uri_end = r->schema_end + 2;
-                state = sw_http_09;
+                state = sw_host_http_09;
                 break;
             default:
                 return NGX_HTTP_PARSE_INVALID_REQUEST;
             }
             break;
 
+        /* space+ after "http://host[:port] " */
+        case sw_host_http_09:
+            switch (ch) {
+            case ' ':
+                break;
+            case CR:
+                r->http_minor = 9;
+                state = sw_almost_done;
+                break;
+            case LF:
+                r->http_minor = 9;
+                goto done;
+            case 'H':
+                r->http_protocol.data = p;
+                state = sw_http_H;
+                break;
+            default:
+                return NGX_HTTP_PARSE_INVALID_REQUEST;
+            }
+            break;
+
+
         /* check "/.", "//", "%", and "\" (Win32) in URI */
         case sw_after_slash_in_uri:
 
@@ -401,7 +425,7 @@
             switch (ch) {
             case ' ':
                 r->uri_end = p;
-                state = sw_http_09;
+                state = sw_check_uri_http_09;
                 break;
             case CR:
                 r->uri_end = p;
@@ -466,7 +490,7 @@
                 break;
             case ' ':
                 r->uri_end = p;
-                state = sw_http_09;
+                state = sw_check_uri_http_09;
                 break;
             case CR:
                 r->uri_end = p;
@@ -503,6 +527,30 @@
             }
             break;
 
+        /* space+ after URI */
+        case sw_check_uri_http_09:
+            switch (ch) {
+            case ' ':
+                break;
+            case CR:
+                r->http_minor = 9;
+                state = sw_almost_done;
+                break;
+            case LF:
+                r->http_minor = 9;
+                goto done;
+            case 'H':
+                r->http_protocol.data = p;
+                state = sw_http_H;
+                break;
+            default:
+                r->space_in_uri = 1;
+                state = sw_check_uri;
+                break;
+            }
+            break;
+
+
         /* URI */
         case sw_uri:
 
@@ -549,7 +597,9 @@
                 state = sw_http_H;
                 break;
             default:
-                return NGX_HTTP_PARSE_INVALID_REQUEST;
+                r->space_in_uri = 1;
+                state = sw_uri;
+                break;
             }
             break;
 
diff --git a/src/http/ngx_http_request.c b/src/http/ngx_http_request.c
index dbc92cf..651cda7 100644
--- a/src/http/ngx_http_request.c
+++ b/src/http/ngx_http_request.c
@@ -756,6 +756,7 @@
             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;
diff --git a/src/http/ngx_http_request.h b/src/http/ngx_http_request.h
index b757f27..920b35d 100644
--- a/src/http/ngx_http_request.h
+++ b/src/http/ngx_http_request.h
@@ -437,6 +437,9 @@
     /* URI with "+" */
     unsigned                          plus_in_uri:1;
 
+    /* URI with " " */
+    unsigned                          space_in_uri:1;
+
     unsigned                          invalid_header:1;
 
     unsigned                          add_uri_to_alias:1;