http: add debug log for ERR_UNESCAPED_CHARACTERS

When encountering ERR_UNESCAPED_CHARACTERS on large applications it can
be unclear which request has caused this error. Even when setting
NODE_DEBUG=http there is no information about this error since it's
thrown before any debug logs. This patch adds a debug log that contains
the invalid path.

PR-URL: #45420
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: aidant

lib/_http_client.js

@@ -173,8 +173,10 @@ function ClientRequest(input, options, cb) {
 
   if (options.path) {
     const path = String(options.path);
-    if (RegExpPrototypeExec(INVALID_PATH_REGEX, path) !== null)
+    if (RegExpPrototypeExec(INVALID_PATH_REGEX, path) !== null) {
+      debug('Path contains unescaped characters: "%s"', path);
       throw new ERR_UNESCAPED_CHARACTERS('Request path');
+    }
   }
 
   if (protocol !== expectedProtocol) {