来源：https://segmentfault.com/a/1190000012233483
http status code常量
1xx
ngx.HTTP_CONTINUE(100) (first added in the v0.9.20 release)ngx.HTTP_SWITCHING_PROTOCOLS(101) (first added in the v0.9.20 release)
2xx
ngx.HTTP_OK(200)ngx.HTTP_CREATED(201)ngx.HTTP_ACCEPTED(202) (first added in the v0.9.20 release)ngx.HTTP_NO_CONTENT(204) (first added in the v0.9.20 release)ngx.HTTP_PARTIAL_CONTENT(206) (first added in the v0.9.20 release)
3xx
ngx.HTTP_SPECIAL_RESPONSE(300)ngx.HTTP_MOVED_PERMANENTLY(301)ngx.HTTP_MOVED_TEMPORARILY(302)ngx.HTTP_SEE_OTHER(303)ngx.HTTP_NOT_MODIFIED(304)ngx.HTTP_TEMPORARY_REDIRECT(307) (first added in the v0.9.20 release)
4xx
ngx.HTTP_BAD_REQUEST(400)ngx.HTTP_UNAUTHORIZED(401)ngx.HTTP_PAYMENT_REQUIRED(402) (first added in the v0.9.20 release)ngx.HTTP_FORBIDDEN(403)ngx.HTTP_NOT_FOUND(404)ngx.HTTP_NOT_ALLOWED(405)ngx.HTTP_NOT_ACCEPTABLE(406) (first added in the v0.9.20 release)ngx.HTTP_REQUEST_TIMEOUT(408) (first added in the v0.9.20 release)ngx.HTTP_CONFLICT(409) (first added in the v0.9.20 release)ngx.HTTP_GONE(410)ngx.HTTP_UPGRADE_REQUIRED(426) (first added in the v0.9.20 release)ngx.HTTP_TOO_MANY_REQUESTS(429) (first added in the v0.9.20 release)ngx.HTTP_CLOSE(444) (first added in the v0.9.20 release)ngx.HTTP_ILLEGAL(451) (first added in the v0.9.20 release)
5xx
ngx.HTTP_INTERNAL_SERVER_ERROR(500)ngx.HTTP_METHOD_NOT_IMPLEMENTED(501)ngx.HTTP_BAD_GATEWAY(502) (first added in the v0.9.20 release)ngx.HTTP_SERVICE_UNAVAILABLE(503)ngx.HTTP_GATEWAY_TIMEOUT(504) (first added in the v0.3.1rc38 release)ngx.HTTP_VERSION_NOT_SUPPORTED(505) (first added in the v0.9.20 release)ngx.HTTP_INSUFFICIENT_STORAGE(507) (first added in the v0.9.20 release)
使用实例
if token == nil then
ngx.exit(ngx.HTTP_FORBIDDEN)
end