Communication with server

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour 
{
    public string url = "https://google.com";
    
    IEnumerator Start() 
    {
        WWW www = new WWW(url); // One get.
        yield return www;
        Debug.Log(www.text); // The data of the url.
    }
}

void Login(string id, string pwd)
{
    WWWForm dataParameters = new WWWForm();    // Create a new form.
    dataParameters.AddField("username", id); 
    dataParameters.AddField("password", pwd);   // Add fields.
    WWW www = new WWW(url+"/account/login",dataParameters);
    StartCoroutine("PostdataEnumerator", www);
}

IEnumerator PostdataEnumerator(WWW www)
{
    yield return www;
    if (!string.IsNullOrEmpty(www.error))
    {
        Debug.Log(www.error);
    }
    else
    {
        Debug.Log("Data Submitted");
    }
}

string mainUrl = "https://server/upload/";
string saveLocation;

void Start() 
{
    saveLocation = "ftp:///home/xxx/x.zip"; // The file path.
    StartCoroutine(PrepareFile());
}

// Prepare The File.
IEnumerator PrepareFile() 
{
    Debug.Log("saveLoacation = " + saveLocation);
     
    // Read the zip file.
    WWW loadTheZip = new WWW(saveLocation);

    yield return loadTheZip;

    PrepareStepTwo(loadTheZip);
}

void PrepareStepTwo(WWW post) 
{
    StartCoroutine(UploadTheZip(post));
}

// Upload.
IEnumerator UploadTheZip(WWW post) 
{
    // Create a form.
    WWWForm form = new WWWForm();
 
    // Add the file.
    form.AddBinaryData("myTestFile.zip",post.bytes,"myFile.zip","application/zip");
 
    // Send POST request.
    string url = mainUrl;
    WWW POSTZIP = new WWW(url,form);
 
    Debug.Log("Sending zip...");
    yield return POSTZIP;
    Debug.Log("Zip sent!");
}