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= nng_http_client_connect(3)
//
// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
// Copyright 2018 Capitar IT Group BV <info@capitar.com>
//
// This document 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_client_connect - establish HTTP client connection
== SYNOPSIS
[source, c]
-----------
#include <nng/nng.h>
#include <nng/supplemental/http/http.h>
void nng_http_client_connect(nng_http_client *client, nng_aio *aio);
-----------
== DESCRIPTION
The `nng_http_client_connect()` starts the process of establishing an HTTP
connection from _client_ to the server that was indicated in the URL that
_client_ was configured with.
The result of the operation will be stored in the _aio_ when the operation
is complete, and will be obtainable via
<<nng_aio_result#,nng_aio_result(3)>>.
On success, a pointer to the underlying HTTP client (type `nng_http_conn *`)
will be stored in the first output result of the _aio_, and can be
obtained by
<<nng_aio_get_output#,nng_aio_get_output(3)>> with an _index_ of zero (0).
== RETURN VALUES
None.
== ERRORS
`NNG_EADDRINVAL`:: The server is configured with an invalid address.
`NNG_ECANCELED`:: The operation was aborted.
`NNG_ECONNREFUSED`:: The TCP connection was refused by the server.
`NNG_ECONNRESET`:: The TCP connection was reset by the server.
`NNG_ENOMEM`:: Insufficient free memory exists.
== EXAMPLE
[source, c]
----
nng_aio *aio;
nng_url *url;
nng_http_client *client;
nng_http_conn *conn;
int rv;
// Error checks elided for clarity.
nng_url_parse(&url, "http://www.google.com");
nng_aio_alloc(&aio, NULL, NULL);
nng_http_client_alloc(&client, url);
nng_http_client_connect(client, aio);
// Wait for connection to establish (or attempt to fail).
nng_aio_wait(aio);
if ((rv = nng_aio_result(aio)) != 0) {
printf("Connection failed: %s\n", nng_strerror(rv));
} else {
// Connection established, get it.
conn = nng_aio_get_output(aio, 0);
// ... do something with it here
// Close the connection when done to avoid leaking it.
nng_http_conn_close(conn);
}
----
== SEE ALSO
<<nng_aio_get_output#,nng_aio_get_output(3)>>,
<<nng_aio_result#,nng_aio_result(3)>>,
<<nng_aio_wait#,nng_aio_wait(3)>>,
<<nng_http_client_alloc#,nng_http_client_alloc(3)>>,
<<nng_http_conn_close#,nng_http_conn_close(3)>>,
<<nng_http_conn_read#,nng_http_conn_read(3)>>,
<<nng_http_conn_write#,nng_http_conn_write(3)>>,
<<nng_strerror#,nng_strerror(3)>>,
<<nng#,nng(7)>>
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