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= gun:data(3)
== Name
gun:data - Stream the body of a request
== Description
[source,erlang]
----
data(ConnPid, StreamRef, IsFin, Data) -> ok
ConnPid :: pid()
StreamRef :: reference()
IsFin :: fin | nofin
Data :: iodata()
----
Stream the body of a request.
This function can only be used if the original request
had headers indicating that a body would be streamed.
All calls to this function must use the `nofin` flag
except for the last which must use `fin` to indicate
the end of the request body.
Empty data is allowed regardless of the value of `IsFin`.
Gun may or may not send empty data chunks, however.
== Arguments
ConnPid::
The pid of the Gun connection process.
StreamRef::
Identifier of the stream for the original request.
IsFin::
Whether this message terminates the request.
Data::
All or part of the response body.
== Return value
The atom `ok` is returned.
== Changelog
* *1.0*: Function introduced.
== Examples
.Stream the body of a request
[source,erlang]
----
StreamRef = gun:put(ConnPid, "/lang/fr_FR/hello", [
{<<"content-type">>, <<"text/plain">>}
]).
gun:data(ConnPid, StreamRef, nofin, <<"Bonjour !\n">>).
gun:data(ConnPid, StreamRef, fin, <<"Bonsoir !\n">>).
----
== See also
link:man:gun(3)[gun(3)],
link:man:gun:patch(3)[gun:patch(3)],
link:man:gun:post(3)[gun:post(3)],
link:man:gun:put(3)[gun:put(3)],
link:man:gun:request(3)[gun:request(3)]
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