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The general HTTP header format contains colon-separated name - value pairs in the header field. Each of the name-value pair end with a carriage return (CR) and a line feed (LF) character sequence. Empty fields at the end of each header indicate the end of the header.

The order in which header fields with differing field names are received is not significant. However, it is "good practice" to send general-header fields first, followed by request-header or response- header fields, and ending with the entity-header fields.

HTTP requests are messages sent by the client to initiate an action on the server. Their start-line contain three elements: An HTTP method, a verb (like GET , PUT or POST ) or a noun (like HEAD or OPTIONS ), that describes the action to be performed.

HTTP headers let the client and the server pass additional information with an HTTP request or response. An HTTP header consists of its case-insensitive name followed by a colon ( : ), then by its value. Whitespace before the value is ignored.

A HTTP body (request) body is the one which carries actual HTTP request data (including form data and uploaded etc.) and HTTP response data from the server ( including files, images etc). While HTTP Request header header can't not contain actual data like as above.

Header fields are colon-separated key-value pairs in clear-text string format, terminated by a carriage return (CR) and line feed (LF) character sequence. The end of the header section is indicated by an empty field line, resulting in the transmission of two consecutive CR-LF pairs.

The header value contains the client certificate from the mutually-authenticated TLS connection between the client and reverse proxy, which enables the backend origin server to utilize the certificate in its application logic.