HTTP: Introduce quoted target marker in HTTP parsing

The quoted_target field is to indentify URLs containing
percent-encoded characters. It can be used in places
where you might need to generate new URL, such as in the
proxy module.
It will be used in the subsequent commit.

src/nxt_http_parse.c

@@ -286,13 +286,11 @@ nxt_http_parse_request_line(nxt_http_request_parse_t *rp, u_char **pos,
         case NXT_HTTP_TARGET_SPACE:
             rp->target_end = p;
             goto space_after_target;
-#if 0
+
         case NXT_HTTP_TARGET_QUOTE_MARK:
             rp->quoted_target = 1;
             goto rest_of_target;
-#else
-        case NXT_HTTP_TARGET_QUOTE_MARK:
-#endif
+
         case NXT_HTTP_TARGET_HASH:
             rp->complex_target = 1;
             goto rest_of_target;
@@ -434,12 +432,7 @@ nxt_http_parse_request_line(nxt_http_request_parse_t *rp, u_char **pos,
 
         rp->request_line_end = p;
 
-        if (rp->complex_target != 0
-#if 0
-            || rp->quoted_target != 0
-#endif
-           )
-        {
+        if (rp->complex_target || rp->quoted_target) {
             rc = nxt_http_parse_complex_target(rp);
 
             if (nxt_slow_path(rc != NXT_OK)) {
@@ -1041,7 +1034,7 @@ nxt_http_parse_complex_target(nxt_http_request_parse_t *rp)
             break;
 
         case sw_quoted:
-            //rp->quoted_target = 1;
+            rp->quoted_target = 1;
 
             if (ch >= '0' && ch <= '9') {
                 high = (u_char) (ch - '0');

src/nxt_http_parse.h

@@ -61,9 +61,9 @@ struct nxt_http_request_parse_s {
 
     /* target with "/." */
     uint8_t                   complex_target;         /* 1 bit */
-#if 0
     /* target with "%" */
     uint8_t                   quoted_target;          /* 1 bit */
+#if 0
     /* target with " " */
     uint8_t                   space_in_target;        /* 1 bit */
 #endif