openresty中几种重定向的差异比较（ngx.redirect、ngx.req.set_uri、ngx.exec）

一. 测试用的nginx.conf：

user root;

worker_processes  1;
error_log logs/error.log;

events {
    worker_connections 1024;
}

http {

    charset       utf-8;
    default_type  application/octet-stream;
	include       /usr/local/openresty/nginx/conf/mime.types;

	rewrite_by_lua_block {
		ngx.log(ngx.ALERT, "（http | rewrite_by）新请求接入，是否内部重定向：" .. tostring(ngx.req.is_internal()))
	}
	access_by_lua_block {
		ngx.log(ngx.ALERT, "（http | access_by）新请求接入，是否内部重定向：" .. tostring(ngx.req.is_internal()))
		ngx.log(ngx.ALERT, "ngx.var.my_var: " .. tostring(ngx.var.my_var))
		ngx.log(ngx.ALERT, "ngx.ctx.my_var: " .. tostring(ngx.ctx.my_var))
	}

    server {
        listen 8080;

		set $my_var "";
		location /redirect {
            rewrite_by_lua_block {
				ngx.log(ngx.ALERT, "（location | rewrite_by | redirect）")
				ngx.var.my_var = "redirect"
				ngx.ctx.my_var = "redirect"
				ngx.redirect("/final")
			}
		}
		location /outside {
            rewrite_by_lua_block {
				ngx.log(ngx.ALERT, "（location | rewrite_by | outside）")
				ngx.var.my_var = "outside"
				ngx.ctx.my_var = "outside"
				ngx.req.set_uri("/final", true)
			}
		}
		location /inside {
            access_by_lua_block {
				ngx.log(ngx.ALERT, "（location | access_by | inside）")
				ngx.var.my_var = "inside"
				ngx.ctx.my_var = "inside"
				ngx.req.set_uri("/final")
			}
			content_by_lua_block {
				ngx.log(ngx.ALERT, "（location | content_by | inside）")
				ngx.header.content_type = "text/html"
				ngx.say("inside: <br>")
				ngx.say("ngx.var.my_var: " .. tostring(ngx.var.my_var) .. "<br>")
				ngx.say("ngx.ctx.my_var: " .. tostring(ngx.ctx.my_var) .. "<br>")
			}
		}
		location /exec {
            access_by_lua_block {
				ngx.log(ngx.ALERT, "（location | access_by | exec）")
				ngx.var.my_var = "exec"
				ngx.ctx.my_var = "exec"
				return ngx.exec('@hide')
			}
		}
		location /mix {
            access_by_lua_block {
				ngx.log(ngx.ALERT, "（location | access_by | mix）")
				ngx.var.my_var = "inside"
				ngx.ctx.my_var = "inside"
				ngx.req.set_uri("/final")
				return ngx.exec('@hide')
			}
		}
		location /final {
			content_by_lua_block {
				ngx.log(ngx.ALERT, "（location | content_by | final）")
				ngx.header.content_type = "text/html"
				ngx.say("final: <br>")
				ngx.say("ngx.var.my_var: " .. tostring(ngx.var.my_var) .. "<br>")
				ngx.say("ngx.ctx.my_var: " .. tostring(ngx.ctx.my_var) .. "<br>")
			}
		}
		location @hide {
			content_by_lua_block {
				ngx.log(ngx.ALERT, "（location | content_by | hide）")
				ngx.header.content_type = "text/html"
				ngx.say("hide: <br>")
				ngx.say("ngx.var.my_var: " .. tostring(ngx.var.my_var) .. "<br>")
				ngx.say("ngx.ctx.my_var: " .. tostring(ngx.ctx.my_var) .. "<br>")
			}
		}
    }

}

二. 测试结果