This documentation is for version v1.3.0 of NNG, but the latest released version is v1.8.0. see the documentation for v1.8.0 for the most up-to-date information.


#include <nng/nng.h>
#include <nng/supplemental/http/http.h>

void nng_http_conn_write_all(nng_http_conn *conn, nng_aio *aio);


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.

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().

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





The operation was canceled.


The connection was closed.


The peer closed the connection.


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


Insufficient free memory to perform the operation.


HTTP operations are not supported.


Timeout waiting for data from the connection.