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Make Query requests idempotent (#1022) 

* Make Query requests idempotent

Address #1020.

Signed-off-by: Tomáš Dohnálek <dohnto@gmail.com>

* Use empty header

Signed-off-by: Tomáš Dohnálek <dohnto@gmail.com>

* Document issue with original documentation

Signed-off-by: Tomáš Dohnálek <dohnto@gmail.com>
This commit is contained in:
Tomas Dohnalek 2022-04-13 07:21:50 +02:00 committed by GitHub
parent 0bab4fda94
commit cc7991d977
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1 changed files with 8 additions and 0 deletions
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8
api/prometheus/v1/api.go
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@ -1139,6 +1139,14 @@ func (h *apiClientImpl) DoGetFallback(ctx context.Context, u *url.URL, args url.
return nil, nil, nil, err
}
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
// Following comment originates from https://pkg.go.dev/net/http#Transport
// Transport only retries a request upon encountering a network error if the request is
// idempotent and either has no body or has its Request.GetBody defined. HTTP requests
// are considered idempotent if they have HTTP methods GET, HEAD, OPTIONS, or TRACE; or
// if their Header map contains an "Idempotency-Key" or "X-Idempotency-Key" entry. If the
// idempotency key value is a zero-length slice, the request is treated as idempotent but
// the header is not sent on the wire.
req.Header["Idempotency-Key"] = nil
resp, body, warnings, err := h.Do(ctx, req)
if resp != nil && (resp.StatusCode == http.StatusMethodNotAllowed || resp.StatusCode == http.StatusNotImplemented) {