Free HTTPs Headers Checker

Our "Free Check HTTP Headers of External Page" tool is a powerful and user-friendly online resource designed to provide you with essential information about the HTTP headers of any external website or web page. Whether you are a developer, a website administrator, or simply a curious internet user, this tool offers valuable insights into how websites communicate with your browser.

Key Features of HTTP Headers Checking Tool:

Instant Analysis: Simply enter the URL of the webpage you want to examine, and our tool will swiftly retrieve and display the HTTP headers associated with that page.
Comprehensive Information: Gain access to a wide range of HTTP header details, including response status codes, content types, server information, and caching directives. Understand how the server is handling requests and responses.
Debugging and Troubleshooting: Use this tool to identify potential issues with external websites, such as misconfigured headers or unexpected server responses. It's an invaluable resource for web developers and IT professionals.
Security Insights: Examine security-related headers, like Content Security Policy (CSP) and HTTP Strict Transport Security (HSTS), to assess the security posture of a website. Identify potential vulnerabilities and areas for improvement.
User-Friendly Interface: Our tool is designed with simplicity in mind, making it accessible to users of all technical levels. Whether you're a beginner or an expert, you can easily navigate and understand the information presented.
No Installation Required: There's no need to install any software or plugins. Access the tool from any web browser on your computer or mobile device.
Free of Charge: Enjoy the convenience of checking HTTP headers for external web pages at no cost. It's a valuable resource for anyone interested in web development, security, or online research.

How to Use HTTP Headers Tool:

Enter the URL of the external webpage you want to analyze in the provided field.
Click the "Check Headers" button.
Wait a moment for the tool to retrieve and display the HTTP headers.
Review the comprehensive information provided, and use it for debugging, security assessment, or any other relevant purposes.

Our "Free Check HTTP Headers of External Page" tool empowers you to gain deeper insights into the inner workings of websites and enhance your web development and security efforts. Try it today and harness the power of HTTP header analysis!

Response Types

HTTP response status codes indicate whether a specific HTTP request has been successfully completed. Each group contains a lot of different responses; on this page, you will find an overview of the most common HTTP status codes. Responses are grouped into five classes: informational responses, successful responses, redirects, client errors, and server errors.

Status Messages

The message that accompanies a server status response code doesn't matter for clients. Most clients rely only on the status code 'number' itself. A message should be seen as a recommendation and it is not required for the client to examine them.

The status message may differ by HTTP version or even between different RFC documents for the same HTTP version. And with the introduction of HTTP/2, the protocol does not contain a status message or reason at all.

NOTE: httpstatus.io only sends requests with version 1.1 of the HTTP protocol.

Informational Responses

An informational response indicates that the request was received and understood. It is issued on a provisional basis while request processing continues. It alerts the client to wait for a final response.

NOTE: You will not see these types of responses using httpstatus.io.

Successful Responses

Status codes that indicate that the server successfully processed the request.

200 OK

The server successfully processed the request. Generally, this means that the server provided the requested page. Read more

204 No Content

The server sent a valid reply to a client request that contains header information only (i.e., does not contain any message body). Web clients can use this status to process server responses more efficiently, avoiding refreshing pages unnecessarily, for example. Read more

Redirection Responses

Further action is needed to fulfill the request. Often, these status codes are used for redirection.

301 Moved Permanently

The requested page has been permanently moved to a new location. When the server returns this response, it automatically forwards the requestor to the new location. The response should also include this location. It tells the client to use the new URL the next time it wants to fetch the same resource. Read more

302 Found

The server is currently responding to the request with a page from a different location, but the requestor should continue to use the original location for future requests. Read more

304 Not Modified

The requested page hasn't been modified since the last request. When the server returns this response, it doesn't return the contents of the page.

307 Temporary Redirect

The server is currently responding to the request with a page from a different location, but the requestor should continue to use the original location for future requests. There is very little difference between a 302 status code and a 307 status code, but you can use both to temporarily point users to another URL. This status code has the same semantic as the 302 Found HTTP response code, with the exception that the user agent must not change the HTTP method used. Read more

308 Permanent Redirect

This means that the resource is now permanently located at another URI, specified by the Location: HTTP Response header. This has the same semantics as the 301 Moved Permanently HTTP response code, with the exception that the user agent must not change the HTTP method used. Read more

Client Error Responses

These status codes indicate that there was likely an error in the request which prevented the server from being able to process it.

400 Bad Request

The server didn't understand the syntax of the request.

401 Unauthorized

The request requires authentication, before a resource can be accessed, the client must be authorized by the server. The server might return this response for a page behind a login.

403 Forbidden

The server is refusing the request. Unlike a 401 unauthorized response, authenticating will make no difference.

404 Not Found

The server can't find the requested page. For instance, the server often returns this code if the request is for a page that doesn't exist on the server.

408 Request Timeout

The request you sent to the website server (e.g. a request to load a web page) took longer than the website's server was prepared to wait. In other words, your connection with the website "timed out".

410 Gone

The server returns this response when the requested resource has been permanently removed. It is similar to a 404 (Not found) code, but is sometimes used in the place of a 404 for resources that used to exist but no longer do. If the resource has permanently moved, you should use a 301 to specify the resource's new location.

429 Too Many Requests

The client has sent too many requests in a given amount of time ("rate limiting").

Server Error Responses

These status codes indicate that the server is aware that it is on error or is incapable of performing the request.

500 Internal Server Error

The server encountered something it didn't expect and was unable to complete the request.

502 Bad Gateway

The server received an invalid response from another server.

503 Service Unavailable

The server is currently unavailable (due to a server overload or because it's down for maintenance). Generally, this is a temporary state.

504 Gateway Timeout Error

The server did not receive a timely response from another server that it was accessing while attempting to load the web page or fill another request by the browser. In other words, 504 errors usually indicate that a different computer, one that the website you're getting the 504 message on doesn't control but relies on, isn't communicating with it quickly enough.