url: add option CURLOPT_SUPPRESS_CONNECT_HEADERS

- Add new option CURLOPT_SUPPRESS_CONNECT_HEADERS to allow suppressing
  proxy CONNECT response headers from the user callback functions
  CURLOPT_HEADERFUNCTION and CURLOPT_WRITEFUNCTION.

- Add new tool option --suppress-connect-headers to expose
  CURLOPT_SUPPRESS_CONNECT_HEADERS and allow suppressing proxy CONNECT
  response headers from --dump-header and --include.

Assisted-by: Jay Satiro
Assisted-by: CarloCannas@users.noreply.github.com
Closes https://github.com/curl/curl/pull/783

1 files changed, 3 insertions, 0 deletions

diff --git a/lib/url.c b/lib/url.c
index f9c324269..c306b5776 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -2894,6 +2894,9 @@ CURLcode Curl_setopt(struct Curl_easy *data, CURLoption option,
   case CURLOPT_CONNECT_TO:
     data->set.connect_to = va_arg(param, struct curl_slist *);
     break;
+  case CURLOPT_SUPPRESS_CONNECT_HEADERS:
+    data->set.suppress_connect_headers = (0 != va_arg(param, long))?TRUE:FALSE;
+    break;
   default:
     /* unknown tag and its companion, just ignore: */
     result = CURLE_UNKNOWN_OPTION;