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fix(provider): improve error messages for non-JSON API responses

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Add multi-layer validation to detect and report HTML error pages
from misconfigured API endpoints:

1. Check Content-Type header for application/json
2. Detect HTML content by checking for '<' prefix and doctype
3. Show response preview in JSON parse errors

This helps users quickly identify api_base URL configuration issues
instead of seeing cryptic 'invalid character < looking for beginning
of value' errors.

Fixes the case where APIs return HTML error pages (404, rate limit
pages, etc.) when the endpoint URL is incorrect.
This commit is contained in:
lms 2026-03-04 15:40:15 +08:00
parent 2f4f45080b
commit fe7ffa8af7
1 changed files with 27 additions and 1 deletions
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28
pkg/providers/openai_compat/provider.go
View file

@ -192,10 +192,31 @@ func (p *Provider) Chat(
return nil, fmt.Errorf("API request failed:\n Status: %d\n Body: %s", resp.StatusCode, string(body))
}
// Check Content-Type header to catch HTML error pages early
contentType := resp.Header.Get("Content-Type")
if contentType != "" && !strings.Contains(strings.ToLower(contentType), "application/json") {
// Truncate body for error message
preview := string(body)
if len(preview) > 200 {
preview = preview[:200] + "..."
}
return nil, fmt.Errorf("API returned non-JSON response (Content-Type: %s, check api_base URL): %s", contentType, preview)
}
return parseResponse(body)
}
func parseResponse(body []byte) (*LLMResponse, error) {
// Check if response is HTML (common when API URL is wrong or returns error page)
if len(body) > 0 && (body[0] == '<' || bytes.HasPrefix(bytes.ToLower(body[:min(len(body), 15)]), []byte("<!doctype")) || bytes.HasPrefix(bytes.ToLower(body[:min(len(body), 6)]), []byte("<html"))) {
// Truncate HTML content for error message
htmlPreview := string(body)
if len(htmlPreview) > 200 {
htmlPreview = htmlPreview[:200] + "..."
}
return nil, fmt.Errorf("API returned HTML instead of JSON (check api_base URL): response starts with %q", htmlPreview)
}
var apiResponse struct {
Choices []struct {
Message struct {
@ -223,7 +244,12 @@ func parseResponse(body []byte) (*LLMResponse, error) {
}
if err := json.Unmarshal(body, &apiResponse); err != nil {
return nil, fmt.Errorf("failed to unmarshal response: %w", err)
// Provide more context for JSON parse errors
preview := string(body)
if len(preview) > 100 {
preview = preview[:100] + "..."
}
return nil, fmt.Errorf("failed to unmarshal response (got: %q): %w", preview, err)
}
if len(apiResponse.Choices) == 0 {