In particular, the HTTP/1.1 definition draws a distinction between history stores and caches. Header fields are colon-separated key-value pairs in clear-text Non-standard header fields were conventionally marked by prefixing the field name with A few fields can contain comments (i.e. For example, the Apache 2.3 server by default limits the size of each field to 8,190 bytes, and there can be at most 100 header fields in a single request.When using HTTP/2, servers should instead send an ALTSVC frame. The header fields are transmitted after the request line (in case of a request HTTP message) or the response line (in case of a response HTTP message), which is the first line of a message. Many user agents show different behavior in loading pages from the history store or cache depending on whether the protocol is HTTP or HTTPS. in User-Agent, Server, Via fields), which can be ignored by software.The standard imposes no limits to the size of each header field name or value, or to the number of fields. This is correct behavior according to the specification. They define the operating parameters of an HTTP transaction. If the user navigates back to a previous page a browser may still show you a page that has been stored on disk in the history store. HTTP header fields are components of the header section of request and response messages in the Hypertext Transfer Protocol. However, most servers, clients, and proxy software impose some limits for practical and security reasons. The request that a resource should not be cached is no guarantee that it will not be written to disk.

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