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HTTP header fields provide required information about the request or response, or about the object sent in the message body. There are four types of HTTP message headers:
- General-header: These header fields have general applicability for both request and response messages.
- Client Request-header: These header fields have applicability only for request messages.
- Server Response-header: These header fields have applicability only for response messages.
- Entity-header: These header fields define meta information about the entity-body or, if no body is present, about the resource identified by the request.
Source: http://www.tutorialspoint.com/http/http_header_fields.htm
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Further Reading: http://code.tutsplus.com/tutorials/http-headers-for-dummies--net-8039
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Related: How to define HTTP Header specification for a website on Apache Server?
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