Trailer

The Trailer header allows a method that the Web server or Web client can use in HTTP messages to include some HTTP headers after the content. Recall that an HTTP message is constructed as follows:

  • Request line (HTTP requests)/Status line (HTTP responses)

  • HTTP headers

  • Content

The use of the Trailer header allows for the following format to be used:

  • Request line (HTTP requests)/Status line (HTTP responses)

  • HTTP headers

  • Content

  • HTTP headers

This allocation is only allowed when a chunked transfer encoding is used, as is specified with the use of the following general header:

Transfer-Encoding: chunked

The headers that are included after the content must be specified by name in the Trailer header. The following example shows an HTTP response ...

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