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CURLOPT_ERRORBUFFER.md: the buffer is read only after curl takes ownership

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Clarifies #17100
Closes #17105
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Max Eliaser 2025-04-19 14:08:06 -07:00 • committed by Daniel Stenberg
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docs/libcurl/opts/CURLOPT_ERRORBUFFER.md
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@ -45,6 +45,10 @@ Since 7.60.0 libcurl initializes the contents of the error buffer to an empty
string before performing the transfer. For earlier versions if an error code
was returned but there was no error detail then the buffer was untouched.
Do not attempt to set the contents of the buffer yourself, including in any
callbacks you write that may be called by libcurl. The library may overwrite
the buffer after your callback returns.
Consider CURLOPT_VERBOSE(3) and CURLOPT_DEBUGFUNCTION(3) to better debug and
trace why errors happen.