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headers_list () will return a list of headers to be sent to the browser / client. To determine whether or not these headers have been sent yet, use headers_sent ().
List of HTTP header fields ... This article lists standard and notable non-standard HTTP header fields. A core set of fields is standardized by the Internet Engineering Task Force (IETF) in RFC 9110 and 9111. The Field Names, Header Fields and Repository of Provisional Registrations are maintained by the IANA.
Dec 21, 2025 · HTTP headers let the client and the server pass additional information with a message in a request or response. In HTTP/1.X, a header is a case-insensitive name followed by a colon, then optional whitespace which will be ignored, and finally by its value (for example: Allow: POST). In HTTP/2 and above, headers are displayed in lowercase when viewed in developer tools (accept: */*), and ...
Apr 4, 2025 · PHP headers_list function tutorial shows how to retrieve HTTP headers in PHP. Learn headers_list with practical examples for header inspection and debugging.
The headers_list () function returns a list of response headers to be sent to the browser. Tip: To determine whether or not the headers have been sent yet, use the headers_sent () function.
Jul 11, 2025 · The header_list () function is an inbuilt function in PHP which returns the list of response header that sent or ready to send to the client or browser, in the form of array. Syntax: array headers_list( void ) Parameters: This function does not accept any parameter. Return Value: It returns a list or array of headers to be sent to the browser or client. Note: It differs from headers_sent ...
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HTTP Security Response Headers Cheat Sheet Introduction HTTP Headers are a great booster for web security with easy implementation. Proper HTTP response headers can help prevent security vulnerabilities like Cross-Site Scripting, Clickjacking, Information disclosure and more. In this cheat sheet, we will review all security-related HTTP headers, recommended configurations, and reference other ...
