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Nikolai Kondrashov provided a clarification for CURLOPT_HEADERFUNCTION

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Daniel Stenberg 2008-05-24 11:19:51 +00:00
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6
docs/libcurl/curl_easy_setopt.3
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@ -270,6 +270,12 @@ of bytes actually taken care of, or return -1 to signal error to the library
(it will cause it to abort the transfer with a \fICURLE_WRITE_ERROR\fP return
code).
If this option is not set, or if it is set to NULL, but
\fICURLOPT_HEADERDATA\fP (\fICURLOPT_WRITEHEADER\fP) is set to anything but
NULL, the function used to accept response data will be used instead. That is,
it will be the function specified with \fICURLOPT_WRITEFUNCTION\fP, or if it
is not specified or NULL - the default, stream-writing function.
Since 7.14.1: When a server sends a chunked encoded transfer, it may contain a
trailer. That trailer is identical to a HTTP header and if such a trailer is
received it is passed to the application using this callback as well. There