How to Debug API Requests and Responses
Inspect HTTP headers, request bodies, response codes, and timing to diagnose API integration issues.
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Debugging API Requests
API integration issues manifest in many ways: unexpected response codes, malformed payloads, authentication failures, and timeout errors. Systematic debugging isolates the problem layer by layer.
HTTP Status Code Diagnosis
Start with the status code. 4xx errors are client-side issues: 400 means your request body is malformed, 401 means authentication failed, 403 means your credentials lack permission, 404 means the endpoint doesn't exist, 422 means the request is syntactically valid but semantically wrong, 429 means you're rate-limited. 5xx errors are server-side: 500 is an unhandled exception, 502/503/504 indicate infrastructure problems.
Request Inspection
Compare your actual request against the API documentation. Check: HTTP method (GET vs POST), Content-Type header (application/json vs multipart/form-data), authentication header format (Bearer vs Basic vs API key), URL encoding of parameters, and request body structure. A common mistake is sending JSON with Content-Type: application/x-www-form-urlencoded.
Response Analysis
Parse the response body for error messages โ many APIs return detailed error descriptions in JSON format. Check the Content-Type of the response: receiving text/html instead of application/json usually means you're hitting a load balancer error page or wrong endpoint. Check response headers for rate limit information (X-RateLimit-Remaining, Retry-After).
Timing and Timeout Issues
Network timeouts can occur at multiple layers: DNS resolution, TCP connection, TLS handshake, time to first byte, and content download. Browser-based API testing tools show timing breakdowns for each phase. If requests work locally but fail in production, check whether your production environment has different network constraints (proxy, firewall, egress rules).
Reproducibility
Document the exact request that fails: method, URL, headers, body, and the response received. Use curl commands or tool-specific request formats that can be shared with the API provider's support team. Include timestamps, since intermittent failures may correlate with the provider's maintenance windows or traffic patterns.
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