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Enable info/refs gzip decompression in HTTP client

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Some HTTP servers try to use gzip compression on the /info/refs
request to save transfer bandwidth. Repositories with many tags
may find the /info/refs request can be gzipped to be 50% of the
original size due to the few but often repeated bytes used (hex
SHA-1 and commonly digits in tag names).

For most HTTP requests enable "Accept-Encoding: gzip" ensuring
the /info/refs payload can use this encoding format.

Only request gzip encoding from servers. Although deflate is
supported by libcurl, most servers have standardized on gzip
encoding for compression as that is what most browsers support.
Asking for deflate increases request sizes by a few bytes, but is
unlikely to ever be used by a server.

Disable the Accept-Encoding header on probe RPCs as response bodies
are supposed to be exactly 4 bytes long, "0000". The HTTP headers
requesting and indicating compression use more space than the data
transferred in the body.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Shawn O. Pearce 2012-09-19 16:12:02 -07:00 committed by Junio C Hamano
parent 25ae7cfd19
commit aa90b9697f
3 changed files with 5 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
http.c
View File

@ -818,6 +818,7 @@ static int http_request(const char *url, void *result, int target, int options)
curl_easy_setopt(slot->curl, CURLOPT_URL, url);
curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
if (start_active_slot(slot)) {
run_active_slot(slot);

4
remote-curl.c
View File

@ -393,7 +393,7 @@ static int probe_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, "");
curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
@ -449,7 +449,7 @@ 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, "");
curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
headers = curl_slist_append(headers, rpc->hdr_content_type);
headers = curl_slist_append(headers, rpc->hdr_accept);

3
t/t5551-http-fetch.sh
View File

@ -32,13 +32,14 @@ setup_askpass_helper
cat >exp <<EOF
> GET /smart/repo.git/info/refs?service=git-upload-pack HTTP/1.1
> Accept: */*
> Accept-Encoding: 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: deflate, gzip
> Accept-Encoding: gzip
> Content-Type: application/x-git-upload-pack-request
> Accept: application/x-git-upload-pack-result
> Content-Length: xxx