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Tomcat Kick Start: Basic Principles of Web Servers

Apr 4, 2003

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The Structure of an HTTP Message

HTTP requests and responses are text-based, and both have a similar four-part structure:

A single line used to denote whether the message is a request or a response
A variable number of header fields terminated
A blank line
The message body (if applicable)

As you will see, not every message type will have a body. The structure of requests and responses is discussed in more detail in the following sections.

NOTE

HTTP is a generic protocol and refers to a uniform resource indicator (URI). A URI is a more general term than the familiar uniform resource locator (URL). Every URL is a URI, but a not all URIs are URLs. In addition to page locations, a URI can be a uniform resource name (URN) such as the mailto: prefix that can be used as a hypertext link on an HTML page.

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