SYNOPSIS
#include <nng/nng.h>
#include <nng/supplemental/http/http.h>
int nng_http_res_add_header(nng_http_res *res, const char *key,
const char *val);DESCRIPTION
The nng_http_res_add_header() adds an HTTP header for the response
res and the key to the val. The key and val are copied.
If a header with the value of key already exists, then a comma and whitespace separate are appended to it, followed by val.
If no such header already exists, then one is created with the value val.
| The HTTP specification requires that duplicate headers be treated identically to a single header with multiple comma-delimited values. |
| See nng_http_res_set_header(3) if replacement of an existing header rather than appending to it is desired. |
The value of key is case insensitive, and should not include the final
colon in an HTTP header. For example, specifying Host or hOSt are
equivalent, whereas the value Host: is not a legal header key.
RETURN VALUES
This function returns 0 on success, and non-zero otherwise.
ERRORS
NNG_ENOMEM-
Insufficient memory to perform the operation.
NNG_ENOTSUP-
No support for HTTP in the library.