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This documentation is for version v1.1.0 of nng, but the latest released version is v1.7.3. see the documentation for v1.7.3 for the most up-to-date information.


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

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


The nng_http_conn_read_all() function starts an asynchronous read from 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 read, or an error has occurred. If the operation completes successfully, then the entire requested data has been read.

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

The main purpose for this function is to facilitate reading HTTP body content, after first determining the length of the body content from the relevant HTTP headers (typically Content-Length).





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.

NNG Reference Manual vv1.1.0 © 2019 Staysail Systems, Inc, © 2018 Capitar IT Group BV
This document is supplied under the MIT License.
nanomsg™ and nng™ are trademarks of Garrett D'Amore.