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nng_http_conn_write_all(3http)

NNG_HTTP_CONN_WRITE_ALL(3http) NNG Reference Manual NNG_HTTP_CONN_WRITE_ALL(3http)

NAME

nng_http_conn_write_all - write all to HTTP connection

SYNOPSIS

#include <nng/nng.h>
#include <nng/supplemental/http/http.h>
void nng_http_conn_write_all(nng_http_conn *conn, nng_aio *aio);

DESCRIPTION

The nng_http_conn_write_all() function starts an asynchronous write to the HTTP connection conn, into the scatter/gather vector located in the asynchronous I/O structure aio.


Note

The nng_aio_set_iov() function must have been
called first, to set the scatter/gather vector for aio.

This function returns immediately, with no return value. Completion of the operation is signaled via the aio, and the final result may be obtained via nng_aio_result(). That result will either be zero or an error code.

The I/O operation completes only when the entire amount of data requested has been written, or an error has occurred. If the operation completes successfully, then the entire requested data has been written.

It is still possible for a partial write to complete in the event of an error. The actual number of bytes written can be determined with nng_aio_count().


Tip

The main purpose for this function is to facilitate writing HTTP
body content.


Tip

Usually an HTTP request or response will have been written immediately
prior to this with http_conn_write_req() or http_conn_write_res(). In that case the request or response should have also contained an Content-Length header, and possibly a Content-Type header.


Tip

An easier solution to sending HTTP content data, is to include the
content with the request or reply using a function like nng_http_req_copy_data(). In that case, the body data will be written automatically by the http_conn_write_req() or http_conn_write_res() function.

RETURN VALUES

None.

ERRORS

NNG_ECANCELED

The operation was canceled.

NNG_ECLOSED

The connection was closed.

NNG_ECONNRESET

The peer closed the connection.

NNG_EINVAL

The aio does not contain a valid scatter/gather vector.

NNG_ENOMEM

Insufficient free memory to perform the operation.

NNG_ENOTSUP

HTTP operations are not supported.

NNG_ETIMEDOUT

Timeout waiting for data from the connection.

SEE ALSO

nng_aio_alloc(3), nng_aio_count(3), nng_aio_result(3), nng_aio_set_iov(3), nng_http_client_connect(3http), nng_http_conn_write(3http), http_conn_write_req(3http), http_conn_write_res(3http), nng_http_req_copy_data(3http), nng_http_req_set_data(3http), nng_http_res_copy_data(3http), nng_http_res_set_data(3http), nng_strerror(3), nng(7)

2026-05-29