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CURLOPT_READFUNCTION.md: mention the seek callback

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Brought-up-by: Jeroen Ooms
URL: https://curl.se/mail/lib-2025-05/0030.html
Closes #17455
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Daniel Stenberg 2025-05-26 12:17:11 +02:00
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docs/libcurl/opts/CURLOPT_READFUNCTION.md
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@ -71,6 +71,11 @@ CURLOPT_INFILESIZE_LARGE(3) or CURLOPT_POSTFIELDSIZE_LARGE(3),
depending on the type of transfer. For some transfer types it may be required
and it allows for better error checking.
When this option is used in combination with telling libcurl to follow
redirects with CURLOPT_FOLLOWLOCATION(3), the data might need to be rewound
and sent again. The CURLOPT_SEEKFUNCTION(3) can then be invoked for that
rewind operation.
# DEFAULT
fread(3)