The Content of HTTP Request Messages
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In addition to the header fields, some request messages include a content portion that the Web server application should process in some way. For example, a POST request might include information that should be added to a database accessed by the Web server application.
The unprocessed value of the content is given by the Content property. If the content can be parsed into fields separated by ampersands (&), a parsed version is available in the ContentFields property.