Document HTTP server API completely.

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+= nng_http_handler_set_tree(3)
+:doctype: manpage
+:manmanual: nng
+:mansource: nng
+:manvolnum: 3
+:copyright: Copyright 2018 mailto:info@staysail.tech[Staysail Systems, Inc.] + \
+            Copyright 2018 mailto:info@capitar.com[Capitar IT Group BV] + \
+            {blank} + \
+            This document is supplied under the terms of the \
+            https://opensource.org/licenses/MIT[MIT License].
+
+== NAME
+
+nng_http_handler_set_tree - set HTTP handler to match trees
+
+== SYNOPSIS
+
+[source, c]
+-----------
+#include <nng/nng.h>
+
+int nng_http_handler_set_tree(nng_http_handler *handler);
+-----------
+
+== DESCRIPTION
+
+The `nng_http_handler_set_tree()` function causes the _handler_ to be
+matched if the Request URI sent by the client is a logical child of
+the path for _handler_.
+
+TIP: This method is useful when constructing API handlers where a single
+service address (path) supports dynamically generated children.
+
+== RETURN VALUES
+
+This function returns 0 on success, and non-zero otherwise.
+
+== ERRORS
+
+`NNG_ENOMEM`:: Insufficient free memory exists.
+`NNG_ENOTSUP`:: No support for HTTP in the library.
+
+== SEE ALSO
+
+<<nng_http_handler_alloc#,nng_http_handler_alloc(3)>>,
+<<nng_http_server_add_handler#,nng_http_server_add_handler(3)>>,
+<<nng_http_req_get_method#,nng_http_req_get_method(3)>>,
+<<nng#,nng(7)>>
+
+== COPYRIGHT
+
+{copyright}