Is HTTP Header Viewer free to use?

Yes, HTTP Header Viewer on DevHexLab is completely free. No login, no account, and no payment required.

Does HTTP Header Viewer upload my data to a server?

No. HTTP Header Viewer runs entirely in your browser using client-side JavaScript. Your data never leaves your device and is never sent to any server.

Can I use HTTP Header Viewer offline?

Yes. Once the page is loaded, HTTP Header Viewer works without an internet connection because all processing happens locally in your browser.

What category does HTTP Header Viewer belong to?

HTTP Header Viewer belongs to the "Developer Utilities" category on DevHexLab. A grab-bag of everyday developer tools: UUID generation, QR code creation, regex testing, SQL formatting, mock data generation, environment-variable parsing, and more. These are the utilities you reach for constantly but do not want to write yourself every time.

HTTP Header Viewer

Inspect and decode HTTP request and response headers

httpheadersinspectrequest

Your Browser Info

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Common HTTP Request Headers

Quick reference for frequently used HTTP request headers.

Header	Description	Example
Accept	Media types the client can handle.	text/html, application/xhtml+xml, /
Accept-Encoding	Compression algorithms the client supports.	gzip, deflate, br
Accept-Language	Preferred natural languages for the response.	en-US,en;q=0.9
Authorization	Credentials to authenticate the client with the server.	Bearer eyJhbGciOiJIUzI1NiJ9...
Cache-Control	Directives for caching mechanisms in requests.	no-cache
Connection	Whether the network connection stays open.	keep-alive
Content-Type	Media type of the request body.	application/json; charset=utf-8
Cookie	Stored HTTP cookies previously sent by the server.	session_id=abc123; theme=dark
Host	Domain name and port of the target server.	www.example.com:443
If-None-Match	Makes the request conditional on the ETag not matching.	"abc123def456"
If-Modified-Since	Makes the request conditional on the resource being modified.	Wed, 21 Oct 2023 07:28:00 GMT
Origin	Origin of the cross-site access request.	https://app.example.com
Referer	Address of the previous page that linked to the current page.	https://example.com/page
User-Agent	Application, OS, vendor, and version of the requesting client.	Mozilla/5.0 (Windows NT 10.0; Win64; x64) Chrome/124
X-Forwarded-For	Identifies the originating IP address through proxies.	203.0.113.195, 70.41.3.18
X-Request-ID	Unique identifier for tracing a request through systems.	f58a8b7c-1d23-4e56-89ab-cdef01234567

HTTP Header Viewer is coming soon

This tool is actively being built and will be available shortly. All other tools on DevHexLab are free and ready to use now.

Check back soon

Learn more

Step-by-step guide

How to View HTTP Headers

Step-by-step guide to inspecting the HTTP headers sent by any URL using the DevHexLab HTTP Header Viewer.

In-depth article

HTTP Response Headers: What They Tell You and How to Inspect Them

HTTP headers carry critical information about caching, security, content type, and more. Learn what the most important headers mean and how to view them for any URL.

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