HTTP Header Parser
About Tool
HTTP headers are the "unseen" instructions sent between a web browser and a server during every request. They carry vital information about caching, security policies, cookies, and server types. This parser provides a readable gateway into that data, taking raw, messy header blocks and turning them into a structured key-value list. It is a fundamental utility for developers debugging API calls, SEOs checking for canonical headers, and security researchers auditing site configurations.
To use the tool, you simply paste a block of raw headers—such as those copied from a browser’s Network tab or a command-line curl output. The parser then separates each line into its respective header name and its value. This transition from a wall of text to a clear table makes it significantly easier to spot missing security headers or check if a `Cache-Control` policy is set correctly for your assets.
Debugging Security and Redirects
Headers like `Content-Security-Policy` (CSP) or `Strict-Transport-Security` (HSTS) are critical for modern web safety. If you find your security headers are misconfigured, you can use the CSP Generator to build a more accurate policy. Similarly, if you are checking for `Location` headers during a series of redirects, this parser can show you exactly where a server is trying to send a user. If those redirects need fixing, the .Htaccess Redirect Generator is the logical next step in your workflow.
Identifying Server Configurations
By parsing the headers of a response, you can often identify the underlying technology powering a website. Headers like `Server` or `X-Powered-By` reveal whether a site is running on Nginx, Apache, or a specific CMS. For developers, checking the `Content-Type` header is essential to ensure that a server is delivering JSON, HTML, or images with the correct MIME type, preventing "broken" content issues in the browser.
How the Parsing Logic Works
The parser handles both request headers (what the browser sends) and response headers (what the server sends back). It is built to recognize the standard format where the key and value are separated by a colon. In cases where a header is sent multiple times—such as `Set-Cookie` headers—the parser lists each one clearly so you can inspect every cookie being placed. This is much faster than manually scanning through a text file or an unformatted log entry.
Workflow Integration
A common scenario involves copying headers from a failed API request and pasting them here to see if a token or a content-length header was missing. Once parsed, you can use the "Copy Parsed" button to save a clean version of the data for your documentation or to share with a teammate. Because the tool runs entirely in the browser, sensitive data like session tokens or authorization keys are never transmitted to our backend, providing a secure environment for technical debugging.
Frequently Asked Questions
What is a "Raw Header" block?
It is the unformatted text you see in a browser's "Network" tab when you click on a request and look at the "Headers" section. It usually looks like "Key: Value" on every line.
Can this tool parse headers from any website?
Yes, as long as you can copy the headers into your clipboard. Most browsers allow you to "Copy as RAW" or "Copy all headers."
Does it handle multi-line headers?
Yes, the parser is designed to handle standard HTTP formatting, including headers that may have long, wrapped values.
Why are some headers missing when I paste them?
Ensure that you have copied the headers in a plain text format. If the lines do not follow the "Key: Value" pattern, the parser may not recognize them correctly.
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