HTTP Headers Info
Parse and inspect HTTP request and response headers with counts, standard definitions, and malformed line detection.
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HTTP Headers Info parses raw HTTP request and response header text online. When you paste header lines into the input area, the parser trims surrounding whitespace and evaluates the text line by line. Every line containing a colon splits at the first colon into a header name and its associated value. Header names convert to lowercase for comparison against recognized network standards, while custom headers remain organized in their own separate group. The analysis provides a total count of detected entries alongside descriptions for standard fields such as Content-Type, Authorization, Host, Cookie, Location, and Server. Nonblank lines missing a colon are preserved as raw malformed entries so you can spot formatting mistakes without losing context. If you submit the form without entering text, the tool displays a reference catalog of common HTTP headers to guide your configuration and inspection workflow.
Instructions
- Paste your raw HTTP header block into the Headers Text field.
- Click the analyze button to process the text.
- Review the breakdown of recognized standard headers, custom headers, and any flagged malformed lines.
Examples
- Parsing standard response headers: pasting 'Content-Type: application/json' and 'Server: nginx' separates both into recognized headers with standard explanations.
- Inspecting custom and malformed lines: pasting 'X-Custom-ID: 12345' along with 'InvalidLineWithoutColon' places the custom header in its own section and reports the raw malformed line for review.
FAQ
Does this tool make live network requests to inspect URLs?
No. The tool processes the raw header text you supply directly in the input box and does not send requests to external websites.
What happens to lines that do not contain a colon?
Nonblank lines without a colon delimiter are preserved and displayed as malformed entries so you can fix syntax errors.
How does the tool handle header name capitalization?
Header names are converted to lowercase before matching against standard specifications, ensuring case-insensitive identification.
What is shown when the input field is left empty?
When no text is entered, the tool notes that no headers were supplied and displays a built-in reference list of common HTTP headers.