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本文主要讲述一下nginx lua如何重置请求参数以及整理了几类常量。
重置请求参数
获取请求参数
local strider = ngx.var.arg_strider
local strider = ngx.req.get_uri_args["strider"]
当请求uri中有多个同名参数时,ngx.var.arg_xx的做法是取第一个出现的值,ngx.req_get_uri_args["xx"]的做法是返回一个table，该table里存放了该参数的所有值
重置参数
local args = ngx.req.get_uri_args()
args["userId"]="override value"
ngx.req.set_uri_args(args)
log级别常量
- ngx.STDERR -- 标准输出
- ngx.EMERG -- 紧急报错
- ngx.ALERT -- 报警
- ngx.CRIT -- 严重，系统故障，触发运维告警系统
- ngx.ERR -- 错误，业务不可恢复性错误
- ngx.WARN -- 告警，业务中可忽略错误
- ngx.NOTICE -- 提醒，业务比较重要信息
- ngx.INFO -- 信息，业务琐碎日志信息，包含不同情况判断等
- ngx.DEBUG -- 调试
使用实例
ngx.log(ngx.ERR,"error occur in ...")
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)
主要用来设置http 返回状态码
使用实例
if token == nil then
ngx.exit(ngx.HTTP_FORBIDDEN)
end
