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Update flashlight to pass as is HTTP responses with certain 4xx status codes #1121

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Update flashlight to pass as is HTTP responses with certain 4xx status codes #1121

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15 changes: 15 additions & 0 deletions proxied/proxied.go
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Original file line number Diff line number Diff line change
Expand Up @@ -52,6 +52,17 @@ func success(resp *http.Response) bool {
return resp.StatusCode > 199 && resp.StatusCode < 400
}

// clientError checks if the given HTTP response has a
// 400 or 401 response code; if so, the response is passed
// as is. Note: we don't treat all 4xx client errors this way
// because our fronted servers return some 403 Forbidden
// whenever use a masquerade host on which domain
// fronting doesn't work
func clientError(resp *http.Response) bool {
return resp.StatusCode == http.StatusUnauthorized ||
resp.StatusCode == http.StatusBadRequest
}

// changeUserAgent prepends app version and OSARCH to the User-Agent header
// of req to facilitate debugging on server side.
func changeUserAgent(req *http.Request) {
Expand Down Expand Up @@ -284,6 +295,10 @@ func (df *dualFetcher) do(req *http.Request, chainedRT http.RoundTripper, ddfRT
log.Debugf("Got successful HTTP call!")
responses <- resp
return resp, nil
} else if clientError(resp) {
log.Debugf("Got HTTP response with client error (%d status code). Passing response as is", resp.StatusCode)
responses <- resp
return resp, nil
}
// If the local proxy can't connect to any upstream proxies, for example,
// it will return a 502.
Expand Down