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CURLOPT_HEADERDATA.3: warn DLL users must set write function #10233

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4 changes: 4 additions & 0 deletions docs/libcurl/opts/CURLOPT_HEADERDATA.3
Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,10 @@ If \fICURLOPT_WRITEFUNCTION(3)\fP or \fICURLOPT_HEADERFUNCTION(3)\fP is used,

If neither of those options are set, \fIpointer\fP must be a valid FILE * and
it will be used by a plain fwrite() to write headers to.

If you are using libcurl as a win32 DLL, you \fBMUST\fP use a
\fICURLOPT_WRITEFUNCTION(3)\fP or \fICURLOPT_HEADERFUNCTION(3)\fP if you set
this option or you will experience crashes.
.SH DEFAULT
NULL
.SH PROTOCOLS
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