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CURLOPT_POSTFIELDS.3: Clarify what happens when set empty

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When CURLOPT_POSTFIELDS is set to an empty string libcurl will send a
zero-byte POST. Prior to this change it was documented as sending data
from the read callback.

This also changes the wording of what happens when empty or NULL so that
it's hopefully easier to understand for people whose primary language
isn't English.

Bug: https://github.com/curl/curl/issues/862
Reported-by: Askar Safin
This commit is contained in:
Jay Satiro 2016-06-11 17:33:16 -04:00
parent 929520582c
commit f77dfbc5fb
1 changed files with 6 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
docs/libcurl/opts/CURLOPT_POSTFIELDS.3
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@ -42,16 +42,15 @@ This POST is a normal application/x-www-form-urlencoded kind (and libcurl will
set that Content-Type by default when this option is used), which is commonly
used by HTML forms. Change Content-Type with \fICURLOPT_HTTPHEADER(3)\fP.
Using \fICURLOPT_POSTFIELDS(3)\fP implies \fICURLOPT_POST(3)\fP.
You can use \fIcurl_easy_escape(3)\fP to url-encode your data, if necessary. It
returns a pointer to an encoded string that can be passed as \fIpostdata\fP.
If you want to do a zero-byte POST, you need to set
\fICURLOPT_POSTFIELDSIZE(3)\fP explicitly to zero, as simply setting
\fICURLOPT_POSTFIELDS(3)\fP to NULL or "" just effectively disables the
sending of the specified string. libcurl will instead assume that you'll send
the POST data using the read callback!
Using \fICURLOPT_POSTFIELDS(3)\fP implies \fICURLOPT_POST(3)\fP.
If \fICURLOPT_POSTFIELDS(3)\fP is explicitly set to NULL then libcurl will get
the POST data from the read callback. If you want to send a zero-byte POST set
\fICURLOPT_POSTFIELDS(3)\fP to an empty string, or set \fICURLOPT_POST(3)\fP to
1 and \fICURLOPT_POSTFIELDSIZE(3)\fP to 0.
Using POST with HTTP 1.1 implies the use of a "Expect: 100-continue" header.
You can disable this header with \fICURLOPT_HTTPHEADER(3)\fP as usual.