For a dynamically generated web page: how can the server come up with the content length specified in the Content-Length header? Remember that in the response the header lines appear before the body
When a HTTP server sends the contents of a document to a client in a response body, it uses the Content-Length header line to specify the byte length of the body. For static documents, the byte length is provided by the file system. But for dynamically generated web pages, such as those generated by a CGI script, the length must be determined at runtime, on the fly.
The contents must be accumulated in a buffer so that the length may be counted and entered in the content length field of the header lines, preceding the contents appearing in the body.
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