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Handle missing etag in 304 Not Modified response

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GitHub now omits the etag, but 304 implies it matches the one we
provided. Just use that one to avoid having an etag-less resource.

Fixes #4469

(cherry picked from commit a766824660)
This commit is contained in:
Matthew Bauer 2021-01-22 14:46:40 -06:00
parent 3a6a2f88f2
commit f95c320500
1 changed files with 7 additions and 0 deletions
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7
src/libstore/download.cc
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@ -349,6 +349,13 @@ struct CurlDownloader : public Downloader
(httpStatus == 200 || httpStatus == 201 || httpStatus == 204 || httpStatus == 206 || httpStatus == 304 || httpStatus == 226 /* FTP */ || httpStatus == 0 /* other protocol */))
{
result.cached = httpStatus == 304;
// In 2021, GitHub responds to If-None-Match with 304,
// but omits ETag. We just use the If-None-Match etag
// since 304 implies they are the same.
if (httpStatus == 304 && result.etag == "")
result.etag = request.expectedETag;
act.progress(result.bodySize, result.bodySize);
done = true;
callback(std::move(result));