Document HTTP request/reply structures and handling.

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+= nng_http_res_set_status(3)
+:doctype: manpage
+:manmanual: nng
+:mansource: nng
+:manvolnum: 3
+:copyright: Copyright 2018 Staysail Systems, Inc. <info@staysail.tech> \
+            Copyright 2018 Capitar IT Group BV <info@capitar.com> \
+            This software is supplied under the terms of the MIT License, a \
+            copy of which should be located in the distribution where this \
+            file was obtained (LICENSE.txt).  A copy of the license may also \
+            be found online at https://opensource.org/licenses/MIT.
+
+== NAME
+
+nng_http_res_set_status - set HTTP response status
+
+== SYNOPSIS
+
+[source, c]
+-----------
+#include <nng/nng.h>
+
+int nng_http_res_set_status(nng_http_res *res, uint16_t status);
+-----------
+
+== DESCRIPTION
+
+The `nng_http_res_set_status()` sets the numeric HTTP status code
+associated with the response _res_ to _status_.   The default value
+for a newly allocated response is 200 (`NNG_HTTP_STATUS_OK`).
+
+The _status_ is not verified, so the caller should take care to ensure
+that only a valid code is supplied.
+
+For convenience, a number of predefined symbols are available.
+
+[source, c]
+----
+enum {
+    NNG_HTTP_STATUS_CONTINUE                 = 100,
+    NNG_HTTP_STATUS_SWITCHING                = 101,
+    NNG_HTTP_STATUS_PROCESSING               = 102,
+    NNG_HTTP_STATUS_OK                       = 200,
+    NNG_HTTP_STATUS_CREATED                  = 201,
+    NNG_HTTP_STATUS_ACCEPTED                 = 202,
+    NNG_HTTP_STATUS_NOT_AUTHORITATIVE        = 203,
+    NNG_HTTP_STATUS_NO_CONTENT               = 204,
+    NNG_HTTP_STATUS_RESET_CONTENT            = 205,
+    NNG_HTTP_STATUS_PARTIAL_CONTENT          = 206,
+    NNG_HTTP_STATUS_MULTI_STATUS             = 207,
+    NNG_HTTP_STATUS_ALREADY_REPORTED         = 208,
+    NNG_HTTP_STATUS_IM_USED                  = 226,
+    NNG_HTTP_STATUS_MULTIPLE_CHOICES         = 300,
+    NNG_HTTP_STATUS_STATUS_MOVED_PERMANENTLY = 301,
+    NNG_HTTP_STATUS_FOUND                    = 302,
+    NNG_HTTP_STATUS_SEE_OTHER                = 303,
+    NNG_HTTP_STATUS_NOT_MODIFIED             = 304,
+    NNG_HTTP_STATUS_USE_PROXY                = 305,
+    NNG_HTTP_STATUS_TEMPORARY_REDIRECT       = 307,
+    NNG_HTTP_STATUS_PERMANENT_REDIRECT       = 308,
+    NNG_HTTP_STATUS_BAD_REQUEST              = 400,
+    NNG_HTTP_STATUS_UNAUTHORIZED             = 401,
+    NNG_HTTP_STATUS_PAYMENT_REQUIRED         = 402,
+    NNG_HTTP_STATUS_FORBIDDEN                = 403,
+    NNG_HTTP_STATUS_NOT_FOUND                = 404,
+    NNG_HTTP_STATUS_METHOD_NOT_ALLOWED       = 405,
+    NNG_HTTP_STATUS_NOT_ACCEPTABLE           = 406,
+    NNG_HTTP_STATUS_PROXY_AUTH_REQUIRED      = 407,
+    NNG_HTTP_STATUS_REQUEST_TIMEOUT          = 408,
+    NNG_HTTP_STATUS_CONFLICT                 = 409,
+    NNG_HTTP_STATUS_GONE                     = 410,
+    NNG_HTTP_STATUS_LENGTH_REQUIRED          = 411,
+    NNG_HTTP_STATUS_PRECONDITION_FAILED      = 412,
+    NNG_HTTP_STATUS_PAYLOAD_TOO_LARGE        = 413,
+    NNG_HTTP_STATUS_ENTITY_TOO_LONG          = 414,
+    NNG_HTTP_STATUS_UNSUPPORTED_MEDIA_TYPE   = 415,
+    NNG_HTTP_STATUS_RANGE_NOT_SATISFIABLE    = 416,
+    NNG_HTTP_STATUS_EXPECTATION_FAILED       = 417,
+    NNG_HTTP_STATUS_TEAPOT                   = 418,
+    NNG_HTTP_STATUS_UNPROCESSABLE_ENTITY     = 422,
+    NNG_HTTP_STATUS_LOCKED                   = 423,
+    NNG_HTTP_STATUS_FAILED_DEPENDENCY        = 424,
+    NNG_HTTP_STATUS_UPGRADE_REQUIRED         = 426,
+    NNG_HTTP_STATUS_PRECONDITION_REQUIRED    = 428,
+    NNG_HTTP_STATUS_TOO_MANY_REQUESTS        = 429,
+    NNG_HTTP_STATUS_HEADERS_TOO_LARGE        = 431,
+    NNG_HTTP_STATUS_UNAVAIL_LEGAL_REASONS    = 451,
+    NNG_HTTP_STATUS_INTERNAL_SERVER_ERROR    = 500,
+    NNG_HTTP_STATUS_NOT_IMPLEMENTED          = 501,
+    NNG_HTTP_STATUS_BAD_GATEWAY              = 502,
+    NNG_HTTP_STATUS_SERVICE_UNAVAILABLE      = 503,
+    NNG_HTTP_STATUS_GATEWAY_TIMEOUT          = 504,
+    NNG_HTTP_STATUS_HTTP_VERSION_NOT_SUPP    = 505,
+    NNG_HTTP_STATUS_VARIANT_ALSO_NEGOTIATES  = 506,
+    NNG_HTTP_STATUS_INSUFFICIENT_STORAGE     = 507,
+    NNG_HTTP_STATUS_LOOP_DETECTED            = 508,
+    NNG_HTTP_STATUS_NOT_EXTENDED             = 510,
+    NNG_HTTP_STATUS_NETWORK_AUTH_REQUIRED    = 511, 
+}       
+----
+
+Please see the relevant HTTP RFCs for the semantics and correct
+use of these status codes.
+
+TIP: It is a good idea to also set the "reason phrase" with
+<<nng_http_res_set_reason#,nng_http_set_reason(3)>>.  This 
+will help any humans who may have to diagnose any failure.
+
+== RETURN VALUES
+
+This function returns 0 on success, and non-zero otherwise.
+
+== ERRORS
+
+`NNG_ENOTSUP`:: No support for HTTP in the library.
+
+== SEE ALSO
+
+<<nng_http_res_alloc#,nng_http_res_alloc(3)>>,
+<<nng_http_res_get_status#,nng_http_req_get_status(3)>>,
+<<nng_http_res_set_reason#,nng_http_req_set_reason(3)>>,
+<<nng#,nng(7)>>
+
+
+== COPYRIGHT
+
+Copyright 2018 mailto:info@staysail.tech[Staysail Systems, Inc.] +
+Copyright 2018 mailto:info@capitar.com[Capitar IT Group BV]
+
+This document is supplied under the terms of the
+https://opensource.org/licenses/MIT[MIT License].