Workflow
How to Read Raw HTTP Headers While Debugging APIs
Learn how to read raw request and response headers in a structured way so auth, caching, and cookie problems are easier to identify.
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Look for the high-signal headers first
When debugging APIs, start with the headers that change behavior the most: Authorization, Content-Type, Accept, Cache-Control, and Set-Cookie. These often explain the bug faster than the body does.
Why raw header blocks are hard to scan
Headers come from browser panels, proxies, curl output, and log lines with little structure. Duplicate values, wrapped cookies, and mixed request or status lines make manual reading slower than it should be.
Parse first, then branch
Use the HTTP Header Parser to normalize the block. If the issue is in a Bearer token, continue with the JWT Decoder. If it points to a redirect or callback problem, inspect the link with the URL Parser & Inspector.
Do not flatten duplicate headers away
Repeated headers are often important, especially Set-Cookie. If your tool keeps only the last one, you can miss the actual state of the response.
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Adjacent guides that support the same workflow or query family.
Auth Debugging Workflows for JWTs, Headers, and Token Expiry
Start here when auth bugs span JWT claims, token generation, headers, and expiry windows.
URL and Request Debugging Workflows for Redirects, Params, and Headers
Use this guide when a request bug spans the URL, query string, redirect chain, and headers.