This documentation is for version v1.3.0 of NNG, but the latest released version is v1.7.2. see the documentation for v1.7.2 for the most up-to-date information.

SYNOPSIS

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

int nng_http_res_set_status(nng_http_res *res, uint16_t status);

DESCRIPTION

The nng_http_res_set_status() sets the numeric HTTP status code associated with the response res to status. The default value for a newly allocated response is 200 (NNG_HTTP_STATUS_OK).

The status is not verified, so the caller should take care to ensure that only a valid code is supplied.

For convenience, a number of predefined symbols are available.

enum {
NNG_HTTP_STATUS_CONTINUE                 = 100,
NNG_HTTP_STATUS_SWITCHING                = 101,
NNG_HTTP_STATUS_PROCESSING               = 102,
NNG_HTTP_STATUS_OK                       = 200,
NNG_HTTP_STATUS_CREATED                  = 201,
NNG_HTTP_STATUS_ACCEPTED                 = 202,
NNG_HTTP_STATUS_NOT_AUTHORITATIVE        = 203,
NNG_HTTP_STATUS_NO_CONTENT               = 204,
NNG_HTTP_STATUS_RESET_CONTENT            = 205,
NNG_HTTP_STATUS_PARTIAL_CONTENT          = 206,
NNG_HTTP_STATUS_MULTI_STATUS             = 207,
NNG_HTTP_STATUS_ALREADY_REPORTED         = 208,
NNG_HTTP_STATUS_IM_USED                  = 226,
NNG_HTTP_STATUS_MULTIPLE_CHOICES         = 300,
NNG_HTTP_STATUS_STATUS_MOVED_PERMANENTLY = 301,
NNG_HTTP_STATUS_FOUND                    = 302,
NNG_HTTP_STATUS_SEE_OTHER                = 303,
NNG_HTTP_STATUS_NOT_MODIFIED             = 304,
NNG_HTTP_STATUS_USE_PROXY                = 305,
NNG_HTTP_STATUS_TEMPORARY_REDIRECT       = 307,
NNG_HTTP_STATUS_PERMANENT_REDIRECT       = 308,
NNG_HTTP_STATUS_BAD_REQUEST              = 400,
NNG_HTTP_STATUS_UNAUTHORIZED             = 401,
NNG_HTTP_STATUS_PAYMENT_REQUIRED         = 402,
NNG_HTTP_STATUS_FORBIDDEN                = 403,
NNG_HTTP_STATUS_NOT_FOUND                = 404,
NNG_HTTP_STATUS_METHOD_NOT_ALLOWED       = 405,
NNG_HTTP_STATUS_NOT_ACCEPTABLE           = 406,
NNG_HTTP_STATUS_PROXY_AUTH_REQUIRED      = 407,
NNG_HTTP_STATUS_REQUEST_TIMEOUT          = 408,
NNG_HTTP_STATUS_CONFLICT                 = 409,
NNG_HTTP_STATUS_GONE                     = 410,
NNG_HTTP_STATUS_LENGTH_REQUIRED          = 411,
NNG_HTTP_STATUS_PRECONDITION_FAILED      = 412,
NNG_HTTP_STATUS_PAYLOAD_TOO_LARGE        = 413,
NNG_HTTP_STATUS_ENTITY_TOO_LONG          = 414,
NNG_HTTP_STATUS_UNSUPPORTED_MEDIA_TYPE   = 415,
NNG_HTTP_STATUS_RANGE_NOT_SATISFIABLE    = 416,
NNG_HTTP_STATUS_EXPECTATION_FAILED       = 417,
NNG_HTTP_STATUS_TEAPOT                   = 418,
NNG_HTTP_STATUS_UNPROCESSABLE_ENTITY     = 422,
NNG_HTTP_STATUS_LOCKED                   = 423,
NNG_HTTP_STATUS_FAILED_DEPENDENCY        = 424,
NNG_HTTP_STATUS_UPGRADE_REQUIRED         = 426,
NNG_HTTP_STATUS_PRECONDITION_REQUIRED    = 428,
NNG_HTTP_STATUS_TOO_MANY_REQUESTS        = 429,
NNG_HTTP_STATUS_HEADERS_TOO_LARGE        = 431,
NNG_HTTP_STATUS_UNAVAIL_LEGAL_REASONS    = 451,
NNG_HTTP_STATUS_INTERNAL_SERVER_ERROR    = 500,
NNG_HTTP_STATUS_NOT_IMPLEMENTED          = 501,
NNG_HTTP_STATUS_BAD_GATEWAY              = 502,
NNG_HTTP_STATUS_SERVICE_UNAVAILABLE      = 503,
NNG_HTTP_STATUS_GATEWAY_TIMEOUT          = 504,
NNG_HTTP_STATUS_HTTP_VERSION_NOT_SUPP    = 505,
NNG_HTTP_STATUS_VARIANT_ALSO_NEGOTIATES  = 506,
NNG_HTTP_STATUS_INSUFFICIENT_STORAGE     = 507,
NNG_HTTP_STATUS_LOOP_DETECTED            = 508,
NNG_HTTP_STATUS_NOT_EXTENDED             = 510,
NNG_HTTP_STATUS_NETWORK_AUTH_REQUIRED    = 511,
};

Please see the relevant HTTP RFCs for the semantics and correct use of these status codes.

It is a good idea to also set the “reason phrase” with nng_http_set_reason(). This will help any humans who may have to diagnose a failure.

RETURN VALUES

This function returns 0 on success, and non-zero otherwise.

ERRORS

NNG_ENOTSUP

No support for HTTP in the library.