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HTTP Header Parser

Parse raw HTTP headers into structured key-value pairs with content-type analysis

POST /v1/http-header-parse

curl -X POST "https://dns.toolkitapi.io/v1/http-header-parse" \
  -H "Content-Type: application/json" \
  -d '{"headers": "HTTP/1.1 200 OK\nContent-Type: application/json; charset=utf-8\nCache-Control: max-age=3600\nX-Request-Id: abc123"}'

import httpx

resp = httpx.post(
    "https://dns.toolkitapi.io/v1/http-header-parse",
    json={"headers": "HTTP/1.1 200 OK\nContent-Type: application/json; charset=utf-8\nCache-Control: max-age=3600\nX-Request-Id: abc123"},
)
print(resp.json())

const resp = await fetch("https://dns.toolkitapi.io/v1/http-header-parse", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
  },
  body: JSON.stringify({"headers": "HTTP/1.1 200 OK\nContent-Type: application/json; charset=utf-8\nCache-Control: max-age=3600\nX-Request-Id: abc123"}),
});
const data = await resp.json();
console.log(data);

# See curl example

Response 200 OK

{
  "headers": {
    "Content-Type": "application/json; charset=utf-8",
    "Cache-Control": "max-age=3600",
    "X-Request-Id": "abc123"
  },
  "count": 3,
  "request_line": "HTTP/1.1 200 OK",
  "content_type": {
    "type": "application/json",
    "params": {"charset": "utf-8"}
  }
}

Try It Live

Description

Parse raw HTTP headers into structured key-value pairs with content-type analysis

How to Use

1

1. Send a POST with a JSON body containing the `headers` field — raw HTTP headers as a multi-line string.

2

2. The first line is automatically detected as a request or status line if it starts with `HTTP/` or contains ` HTTP/`.

3

3. Inspect `headers` for the parsed key-value pairs, `request_line` for the status/request line, and `content_type` for parsed media type details.

About This Tool

HTTP Header Parser takes raw HTTP headers (as you'd see in a `curl -v` dump or browser dev tools) and converts them into a structured JSON object. It automatically detects and separates the request/status line, parses all header key-value pairs, and extracts `Content-Type` details including media type and parameters.

Duplicate header names are collected into arrays.

Why Use This Tool

Debugging — Parse headers from curl output or browser dev tools into a readable format
Security auditing — Extract and review security headers (CSP, HSTS, X-Frame-Options)
API testing — Verify response headers match expectations
Log analysis — Parse header blocks from HTTP access logs

Frequently Asked Questions

How are duplicate headers handled?

Headers appearing multiple times are returned as an array of values. Single-occurrence headers are returned as strings.

Is the request/status line required?

No. If the first line doesn't match an HTTP request or status line pattern, all lines are treated as headers.

Which Content-Type details are extracted?

The media type is separated from parameters (like `charset`, `boundary`). This only applies when a `Content-Type` header is present.

Start using HTTP Header Parser now

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