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client: do not fallback to GET if HEAD on _ping fail to connect 

When we see an `ECONNREFUSED` (or equivalent) from an attempted `HEAD` on the
`/_ping` endpoint there is no point in trying again with `GET` since the server
is not responding/available at all.

Once vendored into the cli this will partially mitigate https://github.com/docker/cli/issues/1739
("Docker commands take 1 minute to timeout if context endpoint is unreachable")
by cutting the effective timeout in half.

Signed-off-by: Ian Campbell <ijc@docker.com>
(cherry picked from commit 8c8457b0f2)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Ian Campbell 2019-05-13 13:48:17 +01:00 committed by Sebastiaan van Stijn
parent ac48309ac4
commit 61a234d562
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1 changed files with 2 additions and 0 deletions
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client/ping.go
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@ -31,6 +31,8 @@ func (cli *Client) Ping(ctx context.Context) (types.Ping, error) {
// Server handled the request, so parse the response
return parsePingResponse(cli, serverResp)
}
} else if IsErrConnectionFailed(err) {
return ping, err
}
req, err = cli.buildRequest("GET", path.Join(cli.basePath, "/_ping"), nil, nil)