allow http protocol to switch to https

switch protocols at random is a bad idea if e.g. http can switch to
file, so we limit the possibilities to http to http and http to https.

As very few people (less than 1% according to popcon) have https
installed this likely changes nothing in terms of failure. The commit is
adding a friendly hint which package needs to be installed though.

1 files changed, 9 insertions, 5 deletions

diff --git a/methods/server.cc b/methods/server.cc
index 76faa7e7f..6dd3970a6 100644
--- a/methods/server.cc
+++ b/methods/server.cc
@@ -291,11 +291,15 @@ ServerMethod::DealWithHeaders(FetchResult &Res)
       }
       else
       {
-         NextURI = DeQuoteString(Server->Location);
-         URI tmpURI = NextURI;
-         // Do not allow a redirection to switch protocol
-         if (tmpURI.Access == "http")
-            return TRY_AGAIN_OR_REDIRECT;
+	 NextURI = DeQuoteString(Server->Location);
+	 URI tmpURI = NextURI;
+	 URI Uri = Queue->Uri;
+	 // same protocol redirects are okay
+	 if (tmpURI.Access == Uri.Access)
+	    return TRY_AGAIN_OR_REDIRECT;
+	 // as well as http to https
+	 else if (Uri.Access == "http" && tmpURI.Access == "https")
+	    return TRY_AGAIN_OR_REDIRECT;
       }
       /* else pass through for error message */
    }