Request body in multipart POST is empty

[ivange94]

I have a simple server in android that I'm trying to access from my PC. I have setup the endpoints like this

server.get("/status", new HttpServerRequestCallback() {
    @Override
    public void onRequest(AsyncHttpServerRequest request, AsyncHttpServerResponse response) {
        Log.d(TAG, "GET /status");
        response.send("Ok");
    }
});

server.post("/scan", new HttpServerRequestCallback() {
    @Override
    public void onRequest(AsyncHttpServerRequest request, AsyncHttpServerResponse response) {
         Log.d(TAG, "POST /scan");
         if (request.getBody() instanceof MultipartFormDataBody) {
             MultipartFormDataBody body = (MultipartFormDataBody) request.getBody();
         }
         response.send("Scanned");
     }
});

I placed a breakpoint inside post request handler and the formData of the request body is always null. I've been unable to access the file submitted in this POST request. I made my request using curl with the command below

curl -F 'filename=@/Users/l4rry/test/names.txt' http://192.168.1.178:8080/scan

I'm I doing something wrong? How can I get multipart POST to work?

[TYUpya]

Has this problem been solved?

[meteorlin]

Solved

• Front End: Vue 3 + vue-resource

let metaInfo = {
   name: "metainfo",
   id: "123",
   color: ["red", "blue"],
}
const formData = new FormData();
Object.keys(metaInfo).forEach(key => {
     formData.append(key, metaInfo[key]);
})

this.$http.post('http://192.168.43.1:5050/test/', formData).then(
    (response) => console.log(response),
    (error) => console.log(error)
);

• AndroidAsync Server End : the post method which listen to special path regex should contain some code below: https://github.com/koush/AndroidAsync/blob/d0042f720c557a27a963553dae1e0ea58d00400f/AndroidAsync/test/src/com/koushikdutta/async/test/MultipartTests.java#L48-L73

NOTE

• Front End:
  • please DO NOT use axios, URLSearchParams or xmlhttprequest to post info;
  • if the object appended in formData is complex structure, you should append each key in the formData but do not just append the whole object in it, which cause Server Get Field is [Object Object] problem;
• Server End:
  • maybe you should set CORS with response.getHeaders().set("Access-Control-Allow-Origin", "*");