GoogleCloudPlatform/microservices-demo · error

failed to read response

Error message

failed to read response

What it means

io.ReadAll failed while reading the shopping assistant's response body after a successful send: the response stream broke mid-read (connection reset, truncated chunked response, or timeout during read).

Source

Thrown at src/frontend/handlers.go:480

	var response LLMResponse

	url := "http://" + fe.shoppingAssistantSvcAddr
	req, err := http.NewRequest(http.MethodPost, url, r.Body)
	if err != nil {
		renderHTTPError(log, r, w, errors.Wrap(err, "failed to create request"), http.StatusInternalServerError)
		return
	}
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Accept", "application/json")
	res, err := http.DefaultClient.Do(req)
	if err != nil {
		renderHTTPError(log, r, w, errors.Wrap(err, "failed to send request"), http.StatusInternalServerError)
		return
	}

	body, err := io.ReadAll(res.Body)
	if err != nil {
		renderHTTPError(log, r, w, errors.Wrap(err, "failed to read response"), http.StatusInternalServerError)
		return
	}

	fmt.Printf("%+v\n", body)
	fmt.Printf("%+v\n", res)

	err = json.Unmarshal(body, &response)
	if err != nil {
		renderHTTPError(log, r, w, errors.Wrap(err, "failed to unmarshal body"), http.StatusInternalServerError)
		return
	}

	// respond with the same message
	json.NewEncoder(w).Encode(Response{Message: response.Content})

	w.WriteHeader(http.StatusOK)
}

View on GitHub (pinned to 72ba613a05)

Solutions

1. Check assistant-side logs for panics or premature connection closes mid-response.
2. Set a client timeout long enough for the assistant's worst-case latency.
3. Retry the request on transient read errors.
4. Verify proxies/load balancers are not cutting long-lived responses.

When it happens

Trigger: Thrown at src/frontend/handlers.go:480 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of GoogleCloudPlatform/microservices-demo@72ba613a05 (2026-09-02). Data as JSON: /api/errors/2a3784e3e2b3d582. Report an issue: GitHub.