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A web server can return a sequence of replies to the web browser by running a Non-Parsed Header (NPH) CGI script, usually of the form:
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It also uses a special MIME-type,
-
multipart/x-mixed-replaced
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which allows each reply to replace the previous one on the same browser page.
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The main part of the document is a container, which has boundary strings between the individual entities, each starting with 2 dashes. The final boundary string also ends with 2 dashes to terminate the entire container.
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