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+.\" **************************************************************************
+.\" * _ _ ____ _
+.\" * Project ___| | | | _ \| |
+.\" * / __| | | | |_) | |
+.\" * | (__| |_| | _ <| |___
+.\" * \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
+.\" * are also available at https://curl.haxx.se/docs/copyright.html.
+.\" *
+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
+.\" * furnished to do so, under the terms of the COPYING file.
+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+.\" * KIND, either express or implied.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_TRAILERDATA 3 "14 Aug 2018" "libcurl 7.64.0" "curl_easy_setopt options"
+
+.SH NAME:
+CURLOPT_TRAILERDATA \- Custom pointer passed to the trailing headers callback
+
+.SH SYNOPSIS:
+#include <curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TRAILERDATA, void *userdata);
+
+.SH DESCRIPTION:
+Data pointer to be passed to the HTTP trailer callback function.
+
+.SH DEFAULT:
+NULL
+
+.SH PROTOCOLS:
+HTTP
+
+.SH EXAMPLE:
+.nf
+/* Assuming we have a CURL handle in the hndl variable. */
+
+struct MyData data;
+
+curl_easy_setopt(hndl, CURLOPT_TRAILERDATA, &data);
+
+.fi
+
+A more complete example can be found in examples/http_trailers.html
+.SH AVAILABILITY:
+This option was added in curl 7.64.0 and is present if HTTP support is enabled
+
+.SH "SEE ALSO"
+.BR CURLOPT_TRAILERFUNCTION "(3), "