Get HTTP Headers

HTTP Status Codes:

HTTP status codes are standardized codes in HTTP responses from a server to indicate the result of a client's request. These codes are grouped into five categories, each characterized by the first digit:

• 1xx (Informational): These indicate that the request was received and the process is continuing.
• 100 Continue: The initial part of a request has been received and has not yet been rejected by the server.
• 101 Switching Protocols: The server is switching protocols as requested by the client (e.g., switching to WebSocket).
• 2xx (Successful): These indicate that the request was successfully received, understood, and accepted.
• 200 OK: The request has succeeded.
• 201 Created: The request has been fulfilled and resulted in a new resource being created.
• 204 No Content: The server successfully processed the request, but is not returning any content.
• 3xx (Redirection): These indicate that further action needs to be taken by the client in order to complete the request.
• 301 Moved Permanently: The resource has permanently moved to a new URL, and future requests should use one of the returned URLs.
• 302 Found: The resource resides temporarily under a different URL.
• 304 Not Modified: Indicates that the resource has not been modified since the version specified by the request headers If-Modified-Since or If-None-Match.
• 4xx (Client Error): These indicate an error that the client made, such as a bad request or a request for a resource that does not exist.
• 400 Bad Request: The server cannot or will not process the request due to something that is perceived to be a client error.
• 401 Unauthorized: The request has not been applied because it lacks valid authentication credentials for the target resource.
• 404 Not Found: The requested resource was not found on the server.
• 5xx (Server Error): These indicate an error on the server side.
• 500 Internal Server Error: A generic error message when the server encounters an unexpected condition.
• 503 Service Unavailable: The server is currently unable to handle the request due to a temporary overloading or maintenance of the server.

Each of these groups helps developers diagnose issues and handle them programmatically when developing web applications.

What is a HTTP Headers Tool?

HTTP Headers Tool is a utility designed to capture and display the HTTP headers sent by a server in response to a request made by a client (usually a web browser or an API client). HTTP headers are a critical part of HTTP requests and responses, carrying information about the client's request or the server's response that is not part of the body of the request or response.

Purpose of HTTP Headers Tool

• Debugging: Developers use HTTP Headers Tools to troubleshoot issues with web applications, such as session problems, caching issues, and security configurations.
• Security Analysis: To ensure security policies like CORS (Cross-Origin Resource Sharing), HSTS (HTTP Strict Transport Security), and other security-related headers are properly implemented.
• Performance Optimization: Checking cache headers can help developers optimize the loading times of web applications.
• Compliance and Testing: To ensure that a web server complies with HTTP standards and behaves as expected under different scenarios.

Features of an HTTP Headers Tool

• View Request Headers: It can show what headers are sent by the client to the server, which can include user agent, accepted response formats, and authentication tokens.
• View Response Headers: It displays the headers sent back from the server, which can include content type, status of caching, server type, and more.
• Custom Requests: Some tools allow users to modify headers sent to the server to test how changes affect the server's response.
• Integration with Browsers: Many tools integrate directly into web browsers as extensions or plugins, providing easy access to header information for each request made by the browser.