= nng_http_handler_collect_body(3http)
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//
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// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
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// Copyright 2018 Capitar IT Group BV <info@capitar.com>
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//
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// This document is supplied under the terms of the MIT License, a
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// copy of which should be located in the distribution where this
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// file was obtained (LICENSE.txt). A copy of the license may also be
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// found online at https://opensource.org/licenses/MIT.
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//
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== NAME
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nng_http_handler_collect_body - set HTTP handler to collect request body
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== SYNOPSIS
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[source, c]
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----
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#include <nng/nng.h>
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#include <nng/supplemental/http/http.h>
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int nng_http_handler_collect_body(nng_http_handler *handler, bool want, size_t maxsz);
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----
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== DESCRIPTION
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The `nng_http_handler_collect_data()` function causes the _handler_ to
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collect any request body that was submitted with the request, and attach
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it to the `nng_http_req` before the handler is called.
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Subsequently the data can be retrieved by the handler from the request with the
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xref:nng_http_req_get_data.3http.adoc[`nng_http_req_get_data()`] function.
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The collection is enabled if _want_ is true.
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Furthermore, the data that the client may sent is limited by the
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value of _maxsz_.
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If the client attempts to send more data than _maxsz_, then the
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request will be terminated with a 400 `Bad Request` status.
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TIP: Limiting the size of incoming request data can provide protection
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against denial of service attacks, as a buffer of the client-supplied
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size must be allocated to receive the data.
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In order to provide an unlimited size, use `(size_t)-1` for _maxsz_.
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The value `0` for _maxsz_ can be used to prevent any data from being passed
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by the client.
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The built-in handlers for files, directories, and static data limit the
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_maxsz_ to zero by default.
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Otherwise the default setting is to enable this capability with a default
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value of _maxsz_ of 1 megabyte.
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NOTE: The handler looks for data indicated by the `Content-Length:` HTTP
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header.
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If this header is absent, the request is assumed not to contain any data.
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NOTE: This specifically does not support the `Chunked` transfer-encoding.
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This is considered a bug, and is a deficiency for full HTTP/1.1 compliance.
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However, few clients send data in this format, so in practice this should
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create few limitations.
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== RETURN VALUES
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This function returns 0 on success, and non-zero otherwise.
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== ERRORS
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[horizontal]
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`NNG_ENOTSUP`:: No support for HTTP in the library.
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== SEE ALSO
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[.text-left]
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xref:nng_http_handler_alloc.3http.adoc[nng_http_handler_alloc(3http)],
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xref:nng_http_server_add_handler.3http.adoc[nng_http_server_add_handler(3http)],
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xref:nng_http_req_get_data.3http.adoc[nng_http_req_get_data(3http)],
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xref:nng.7.adoc[nng(7)]
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