How to use this tool
Paste plain HTTP/1-style field lines, optionally preceded by a request or status line. Names are grouped case-insensitively while original order and spelling remain visible. Duplicate fields are not combined. Folded lines, HTTP/2 pseudo-headers and control characters are rejected. The tool does not fetch a URL or assess a server’s security configuration.
Try these values
Two Set-Cookie fields remain two separate values. Content-Type and content-type share the same grouped name.
Common questions
Does my input leave this page?
The tool processes its input in your browser. It does not send the text to our server for calculation. If advertising is enabled, third-party ad scripts also run on the page; use a trusted offline tool for secrets.
Can I use the result in my project?
Yes. Check the example and limitations first, and test the output with the system that will consume it.
Something doesn’t add up? Report an issue · Methods & corrections