Added requestOptions param

.gitignore

@@ -1,4 +1,5 @@
 .DS_Store
+.idea
 *.swp
 node_modules
 coverage.html

lib/node-trello.js

@@ -4,14 +4,15 @@ var OAuth = require("./trello-oauth");
 
 // Creates a new Trello request wrapper.
 // Syntax: new Trello(applicationApiKey, userToken)
-var Trello = module.exports = function (key, token) {
+var Trello = module.exports = function (key, token, requestOptions) {
   if (!key) {
     throw new Error("Application API key is required");
   }
 
   this.key = key;
   this.token = token;
   this.host = "https://api.trello.com";
+  this.requestOptions = requestOptions;
 };
 
 // Make a GET request to Trello.
@@ -61,27 +62,28 @@ Trello.prototype.request = function (method, uri, argsOrCallback, callback) {
     url += "?" + querystring.stringify(this.addAuthArgs(this.parseQuery(uri, args)));
   }
 
-  var options = {
+  var options = Object.assign({}, this.requestOptions, {
     url: url,
-    method: method
-  };
-
-  if (args.attachment) {
-    options.formData = {
-      key: this.key,
-      token: this.token
-    };
+    method: method,
+    json: true
+  });
 
-    if (typeof args.attachment === "string" || args.attachment instanceof String) {
-      options.formData.url = args.attachment;
-    }
-    else {
-      options.formData.file = args.attachment;
+  if (method !== "GET") {
+    if (args.attachment) {
+      options.formData = {
+        key: this.key,
+        token: this.token
+      };
+
+      if (typeof args.attachment === "string" || args.attachment instanceof String) {
+        options.formData.url = args.attachment;
+      } else {
+        options.formData.file = args.attachment;
+      }
+    } else {
+      options.json = this.addAuthArgs(this.parseQuery(uri, args));
     }
   }
-  else {
-    options.json = this.addAuthArgs(this.parseQuery(uri, args));
-  }
 
   request[method === 'DELETE' ? 'del' : method.toLowerCase()](options, function (err, response, body) {
     if (!err && response.statusCode >= 400) {