docs: function(fileKey, fileName, mimeType, params, headers, httpMethod) {
      this.fileKey = fileKey || null;
      this.fileName = fileName || null;
      this.mimeType = mimeType || null;
      this.headers = headers || null;
      this.httpMethod = httpMethod || null;
  
      if(params && typeof params != typeof "") {
          var arrParams = [];
          for(var v in params) {
              arrParams.push(v + "=" + params[v]);
          }
          this.params = encodeURIComponent(arrParams.join("&"));
      }
      else {
          this.params = params || null;
      }
  }