Developer Tools

HTTP Header Inspector

Parse raw HTTP headers into a structured table with descriptions and categories.

All (13)Response (2)Caching (2)Security (5)CORS (1)Content (2)Other (1)
Content-TypeContent

application/json; charset=utf-8

MIME type of the response body

Content-LengthContent

1234

Size of the response body in bytes

Cache-ControlCaching

public, max-age=3600

Directives for caching mechanisms

ETagCaching

"abc123"

Identifier for a specific version of a resource

Strict-Transport-SecuritySecurity

max-age=31536000; includeSubDomains

Force HTTPS connections (HSTS)

X-Content-Type-OptionsSecurity

nosniff

Prevents MIME type sniffing (nosniff)

X-Frame-OptionsSecurity

DENY

Controls whether page can be in iframe

Content-Security-PolicySecurity

default-src 'self'

Controls resources the browser can load

Referrer-PolicySecurity

strict-origin-when-cross-origin

Controls how much referrer info is sent

Access-Control-Allow-OriginCORS

*

Origins allowed for CORS requests

ServerResponse

nginx/1.24.0

Software used by the origin server

DateOther

Thu, 19 Mar 2026 00:00:00 GMT

Date and time the message was sent

Set-CookieResponse

session=abc123; Path=/; HttpOnly; Secure

Set a cookie on the client

Related Tools

📋
.env Editor
Parse, edit, diff, and export .env files with duplicate detection
📄
CSV Viewer & Editor
Parse, edit, sort, filter CSV data and export as JSON, TSV, or Markdown
🔢
Semver Calculator
Test semver ranges, compare versions, and explore version range syntax
🌿
Git Command Builder
Interactive git command constructor with 40+ operations and explanations

🔒 This tool runs entirely in your browser. No data is sent to any server.