What is the maximum chunk size in HTTP response with Transfer-Encoding chunked?

http http-headers transfer-encoding rfc2616
schwer picture schwer · Aug 14, 2011 · Viewed 16.6k times · Source

The w3.org (RFC2616) seems not to define a maximum size for chunks. But without a maximum chunk-size there is no space for the chunk-extension. There must be a maximum chunk-size, else I can't ignore the chunk-extension as I'm advised to do if it can't be understood (Quote:"MUST ignore chunk-extension extensions they do not understand").

Answer

David Schwartz picture David Schwartz · Aug 14, 2011

Each chunk extension must begin with a semi-colon and the list of chunk extensions must end with a CRLF. When parsing the chunk-size, stop at either a semi-colon or a CRLF. If you stopped at a semi-colon, ignore everything up to the next CRLF. There is no need for a maximum chunk-size.

chunk          = chunk-size [ chunk-extension ] CRLF
                 chunk-data CRLF

chunk-size     = 1*HEX

chunk-extension= *( ";" chunk-ext-name [ "=" chunk-ext-val ] )

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