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An expansion of the 400 Bad Request response code, used when the client has made a HTTP request to a port listening for HTTPS requests. Used when the client has closed the request before the server could send a response.
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One use is to begin a request on the normal HTTP port but switch to Transport Layer Security (TLS). [1] In practice such use is rare, with HTTPS being a far more common way to initiate encrypted HTTP. The server returns a 426 status code to alert legacy clients that the failure was client-related ( 400 level codes indicate a client failure).
HTTP. HTTP header fields are a list of strings sent and received by both the client program and server on every HTTP request and response. These headers are usually invisible to the end-user and are only processed or logged by the server and client applications. They define how information sent/received through the connection are encoded (as in ...
The response status code is a three-digit integer code representing the result of the server's attempt to understand and satisfy the client's corresponding request.
HTTP message. The request/response message consists of the following: Request line, such as GET /logo.gif HTTP/1.1 or Status line, such as HTTP/1.1 200 OK, Headers. An empty line. Optional HTTP message body data. The request/status line and headers must all end with <CR><LF> (that is, a carriage return followed by a line feed).
HTTP/2 allows the server to "push" content, that is, to respond with data for more queries than the client requested. This allows the server to supply data it knows a web browser will need to render a web page, without waiting for the browser to examine the first response, and without the overhead of an additional request cycle.
The 502 Bad Gateway error is an HTTP status code that occurs when a server acting as a gateway or proxy receives an invalid or faulty response from another server in the communication chain. [1]