I don't understand the below code
const req = new HttpRequest('POST', '/upload/file', file, {
reportProgress: true
});
I need clarity on the second argument which is a URL, at the moment I do not understand how it is supposed to map to server. I do realize that the above code doesn't use http, and. That's where I get lost. Please explain how server will see this request without URL.
The code won't work if you don't specify the url. Typically springboot works in 8080 port in local machine. Following is a sample code of controller.
@RestController
@RequestMapping("/upload")
public class ExampleClass{
@PostMapping("/file")
public String fileUpload(MultipartFile file){
// upload file code
}
}
@RequestMapping("/upload") is a parent mapping of whole controller, and @PostMapping("/file") is a child mapping. (It depends if you need @PostMapping("/upload/file") you can have it). This is the path you need to send the request to server from the front-end. So server will identity that this is the post request coming, so it will execute the method.
if you server port is running in 8080, you need to change to 'localhost:8080/upload/file' instead of /upload/file
