September 17, 2020 gateway business process has two tasks: referer certification and non commodity Templating

gateway The main function ：
External request ->1.gw Resolve request ->2. towards ad-server Send a request ->3. analysis ad-server An answer from ->4. Send an answer to the outside
Look outside , Just give gateway send out request, then gateway Return to one response.

// External supply gateway send out request, then gateway Return to one response.
bool BidRequestHandler::ProcessBidRequest(const shared_ptr<HttpRequest> request, shared_ptr<HttpResponse> response) {
    

// Where are the four steps in the code 
// 1.
shared_ptr<BidRequest> bid_request = handler->ParseBidRequest();
// 2.3.
bool ret = handler->CallServices(request, bid_request, ads_req, ads_resp, fill_data_arr, err_msg);
	// 2.
	err_msg = PrepareCallAds(request, bid_request, ads_req);
	// 3.
	ads_resp = GetAdsResponse(ads_req);
// 4.
if (handler->WriteBidResponse(fill_data_arr, response)) 

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Realize two small functions ：
1. Non commodity （ Such as shops ） templated . Set up some uniform templates for the front end , Replace the previous front-end definition of one style at a time , The back end will process after judgment .
Implementation method ： Set up several templates , Provide front-end options .
2. add to referer Verify and log .
Purpose ： Control some web pages , Keep these pages from advertising .
Implementation method ： from HTTP Of Headers Remove from Reference（ Records the of the parent page url）, If there is one in the blacklist, it will be killed and returned directly , No advertising . hold referer Fall log -> Sinan （ It was originally called compass in the code ）

http Of request Requested header in ,referer The page that initiated the request is recorded （ Is where the request came from ）.
An example ： Search for a content from Baidu's homepage request head ：

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,/;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate, br
Accept-Language: zh-CN,zh;q=0.9
Connection: keep-alive
Cookie: ……
Host: www.baidu.com
Referer: https://www.baidu.com/
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: same-origin
Sec-Fetch-User: ?1
Upgrade-Insecure-Requests: 1
User-Agent: ……

You can see referer Baidu Homepage , Explain that this request is from Baidu's home page .