max http header

The maximum size of an HTTP header field is determined by the server or client software that is being used. The official HTTP/1.1 specification does not define a specific maximum size for HTTP headers, but it suggests that servers and clients should use a practical upper limit to avoid denial of service attacks.

In practice, most servers and clients enforce a maximum size for HTTP headers. For example, Apache HTTP Server sets a default limit of 8190 bytes for the size of a request header field, while Nginx sets a default limit of 8KB. Browsers such as Google Chrome enforce a limit of 256KB for the size of a response header.

It is important to note that exceeding the maximum size of an HTTP header can result in errors or denial of service conditions. Therefore, it is important to ensure that your HTTP headers are within the limits set by your server or client software.