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nghttp2_pack_settings_payload
=============================
Synopsis
--------
*#include <nghttp2/nghttp2.h>*
.. function:: ssize_t nghttp2_pack_settings_payload( uint8_t *buf, size_t buflen, const nghttp2_settings_entry *iv, size_t niv)
.. warning::
Deprecated. Use `nghttp2_pack_settings_payload2()` instead.
Serializes the SETTINGS values *iv* in the *buf*. The size of the
*buf* is specified by *buflen*. The number of entries in the *iv*
array is given by *niv*. The required space in *buf* for the *niv*
entries is ``6*niv`` bytes and if the given buffer is too small, an
error is returned. This function is used mainly for creating a
SETTINGS payload to be sent with the ``HTTP2-Settings`` header
field in an HTTP Upgrade request. The data written in *buf* is NOT
base64url encoded and the application is responsible for encoding.
This function returns the number of bytes written in *buf*, or one
of the following negative error codes:
:enum:`nghttp2_error.NGHTTP2_ERR_INVALID_ARGUMENT`
The *iv* contains duplicate settings ID or invalid value.
:enum:`nghttp2_error.NGHTTP2_ERR_INSUFF_BUFSIZE`
The provided *buflen* size is too small to hold the output.
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