Merge branch 'bw/remote-curl-compressed-responses'

Our HTTP client code used to advertise that we accept gzip encoding
from the other side; instead, just let cURL library to advertise
and negotiate the best one.

* bw/remote-curl-compressed-responses:
  remote-curl: accept compressed responses with protocol v2
  remote-curl: accept all encodings supported by curl

http.c

@@ -1788,7 +1788,7 @@ static int http_request(const char *url,
 
 	curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 	curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
-	curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
+	curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 
 	ret = run_one_slot(slot, &results);
 

remote-curl.c

@@ -684,7 +684,7 @@ retry:
 	curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 	curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 	curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
-	curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
+	curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 
 	if (large_request) {
 		/* The request body is large and the size cannot be predicted.
@@ -1259,6 +1259,7 @@ static int proxy_request(struct proxy_state *p)
 
 	slot = get_active_slot();
 
+	curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 	curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 	curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 	curl_easy_setopt(slot->curl, CURLOPT_URL, p->service_url);

t/t5551-http-fetch-smart.sh

@@ -26,14 +26,14 @@ setup_askpass_helper
 cat >exp <<EOF
 > GET /smart/repo.git/info/refs?service=git-upload-pack HTTP/1.1
 > Accept: */*
-> Accept-Encoding: gzip
+> Accept-Encoding: ENCODINGS
 > Pragma: no-cache
 < HTTP/1.1 200 OK
 < Pragma: no-cache
 < Cache-Control: no-cache, max-age=0, must-revalidate
 < Content-Type: application/x-git-upload-pack-advertisement
 > POST /smart/repo.git/git-upload-pack HTTP/1.1
-> Accept-Encoding: gzip
+> Accept-Encoding: ENCODINGS
 > Content-Type: application/x-git-upload-pack-request
 > Accept: application/x-git-upload-pack-result
 > Content-Length: xxx
@@ -79,8 +79,13 @@ test_expect_success 'clone http repository' '
 		/^< Date: /d
 		/^< Content-Length: /d
 		/^< Transfer-Encoding: /d
-	" >act &&
-	test_cmp exp act
+	" >actual &&
+	sed -e "s/^> Accept-Encoding: .*/> Accept-Encoding: ENCODINGS/" \
+			actual >actual.smudged &&
+	test_cmp exp actual.smudged &&
+
+	grep "Accept-Encoding:.*gzip" actual >actual.gzip &&
+	test_line_count = 2 actual.gzip
 '
 
 test_expect_success 'fetch changes via http' '