[PATCH 1/2] remote-curl: accept all encoding supported by curl

[Brandon Williams <bmwill@google.com>]

Configure curl to accept all encoding which curl supports instead of
only accepting gzip responses.

This is necessary to fix a bug when using an installation of curl which
doesn't support gzip.  Since curl doesn't do any checking to verify that
it supports the encoding set when calling 'curl_easy_setopt()', curl can
end up sending an "Accept-Encoding" header indicating that it supports
a particular encoding when in fact it doesn't.  Instead when the empty
string "" is used when setting `CURLOPT_ENCODING`, curl will send an
"Accept-Encoding" header containing only the encoding methods curl
supports.

Signed-off-by: Brandon Williams <bmwill@google.com>
---
 http.c                      | 2 +-
 remote-curl.c               | 2 +-
 t/t5551-http-fetch-smart.sh | 4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/http.c b/http.c
index fed13b216..709150fc7 100644
--- a/http.c
+++ b/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);
 
diff --git a/remote-curl.c b/remote-curl.c
index ceb05347b..565bba104 100644
--- a/remote-curl.c
+++ b/remote-curl.c
@@ -684,7 +684,7 @@ static int post_rpc(struct rpc_state *rpc)
 	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.
diff --git a/t/t5551-http-fetch-smart.sh b/t/t5551-http-fetch-smart.sh
index f5721b4a5..39c65482c 100755
--- a/t/t5551-http-fetch-smart.sh
+++ b/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: deflate, gzip
 > 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: deflate, gzip
 > Content-Type: application/x-git-upload-pack-request
 > Accept: application/x-git-upload-pack-result
 > Content-Length: xxx
-- 
2.17.0.441.gb46fe60e1d-goog