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nng_http_conn_read_all(3http)

NAME

nng_http_conn_read_all - read all from HTTP connection

SYNOPSIS

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

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

DESCRIPTION

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.

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 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().

Tip
 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).

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.