support node buffers less than 8192 bytes (#773)

lib/utils.js

@@ -18,6 +18,16 @@ function isArray(val) {
   return toString.call(val) === '[object Array]';
 }
 
+/**
+ * Determine if a value is a Node Buffer
+ *
+ * @param {Object} val The value to test
+ * @returns {boolean} True if value is a Node Buffer, otherwise false
+ */
+function isBuffer(val) {
+  return ((typeof Buffer !== 'undefined') && (Buffer.isBuffer) && (Buffer.isBuffer(val)));
+}
+
 /**
  * Determine if a value is an ArrayBuffer
  *
@@ -281,6 +291,7 @@ function extend(a, b, thisArg) {
 module.exports = {
   isArray: isArray,
   isArrayBuffer: isArrayBuffer,
+  isBuffer: isBuffer,
   isFormData: isFormData,
   isArrayBufferView: isArrayBufferView,
   isString: isString,