Use Nginx to avoid ajax cross-domain requests

This time I will bring you how to use Nginx to avoid ajax cross-domain requests and use Nginx to avoid ajax cross-domain requests. What are the precautions? Here are actual cases, let’s take a look.

nginx + tomcat on the server, where nginx listens to port 80 and tomcat listens to port 8080.

Because I am not familiar with the front-end, I thought that using ajax would eliminate the need for callback. However, the front-end classmates said that callback is not needed unless it is cross-domain, and asked me to add it to the returned json. But I just learned the most basic usage of spring-mvc, and I don’t know how to add callback

I found some feasible code online, which looks like this:

@RequestMapping(method=RequestMethod.GET,value="getProjectStatusList",produces="text/html;charset=UTF-8")
@ResponseBody
public String getProjectStatusList(HttpServletRequest request, 
HttpServletResponse response){
Map<String,Object> map = new HashMap<String,Object>();
try{
String callback = request.getParameter("callback");
//System.out.println("token:"+request.getHeader("token"));
List<String> list = ss.getProjectStatusList();
map.put("status", "success");
map.put("data", list);
ObjectMapper mapper = new ObjectMapper();
//这个拼接是重点。。。
String result = callback+"("+mapper.writeValueAsString(map)+")";
//String result = mapper.writeValueAsString(map);
return result;
}catch(Exception e){
JSONObject jo = new JSONObject();
jo.put("status", "fail");
jo.put("data", e.getMessage());
return jo.toString();
}
}

However, this change is not helpful It's a real hassle for me because I have too many URL mappings and the cost of modification is too high.

So I was smart and thought of nginx. Isn’t this guy just used for reverse proxy? It’s so clever as me

With this idea, it’s easy to do it. Directly add a location to the server listening on port 80:

location /myApp {
proxy_pass http://localhost:8080/myApp;
}

Reload nginx:

{NGINX_HOME}/sbin/nginx -s reload

I believe you have mastered the method after reading the case in this article, more exciting Please pay attention to other related articles on php Chinese website!

Recommended reading:

How to use readyState and status in Ajax

How to use get and post in Ajax What problems are encountered and how to deal with them

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