{input,storage}/curl: set CURLOPT_HTTPAUTH=CURLAUTH_BASIC

With the default value CURLAUTH_ANY, libcurl needs to probe for
authentication methods first, and only the second request will have an
Authorization header.

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1155

NEWS

@@ -1,6 +1,8 @@
 ver 0.22.7 (not yet released)
 * protocol
   - don't use glibc extension to parse time stamps
+* input
+  - curl: send user/password in the first request, save one roundtrip
 * decoder
   - ffmpeg: fix build problem with FFmpeg 3.4
   - gme: support RSN files

src/input/plugins/CurlInputPlugin.cxx

@@ -421,6 +421,10 @@ CurlInputStream::InitEasy()
 	request->SetOption(CURLOPT_MAXREDIRS, 5L);
 	request->SetOption(CURLOPT_FAILONERROR, 1L);
 
+	/* this option eliminates the probe request when
+	   username/password are specified */
+	request->SetOption(CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
+
 	if (proxy != nullptr)
 		request->SetOption(CURLOPT_PROXY, proxy);
 

src/storage/plugins/CurlStorage.cxx

@@ -262,6 +262,10 @@ public:
 		request.SetOption(CURLOPT_FOLLOWLOCATION, 1L);
 		request.SetOption(CURLOPT_MAXREDIRS, 1L);
 
+		/* this option eliminates the probe request when
+		   username/password are specified */
+		request.SetOption(CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
+
 		request_headers.Append(StringFormat<40>("depth: %u", depth));
 		request_headers.Append("content-type: text/xml");