using pcall to catch exception

scripts/wx_download.lua

@@ -22,7 +22,7 @@ local function get_access_token()
 
     ngx.log(ngx.INFO, "START REQUEST TO GET ACCESS TOKEN -> ", pl.write(sudoerToken))
 
-    local req_status, resp, resp_err = pcall(httpc:request_uri,
+    local no_exception, resp, resp_err = pcall(httpc:request_uri,
             remote_url,
             {
                 ssl_verify = false, -- 设置参数 ssl_verify 为false 不校验ssl证书
@@ -35,7 +35,7 @@ local function get_access_token()
 
     ngx.log(ngx.INFO, "RESP -> ", pl.write(resp))
 
-    if req_status == true then
+    if no_exception == true then
         if 200 ~= resp.status then
             ngx.log(ngx.ERR, "GET ACCESS TOKEN *FAILED*", pl.write(resp_err))
             ngx.say(pl.write(resp_err))