diff --git a/lib/adapters/http.js b/lib/adapters/http.js
index 3c3970a..84be87b 100644
--- a/lib/adapters/http.js
+++ b/lib/adapters/http.js
@@ -10,6 +10,13 @@ var zlib = require('zlib');
 var pkg = require('./../../package.json');
 var Buffer = require('buffer').Buffer;
 
+// Resolve or reject the Promise based on the status
+function settle(resolve, reject, response) {
+  (response.status >= 200 && response.status < 300 ?
+    resolve :
+    reject)(response);
+}
+
 /*eslint consistent-return:0*/
 module.exports = function httpAdapter(resolve, reject, config) {
   var data = config.data;
@@ -24,13 +31,13 @@ module.exports = function httpAdapter(resolve, reject, config) {
     headers['User-Agent'] = 'axios/' + pkg.version;
   }
 
-  if (data) {
+  if (data && !utils.isStream(data)) {
     if (utils.isArrayBuffer(data)) {
       data = new Buffer(new Uint8Array(data));
     } else if (utils.isString(data)) {
       data = new Buffer(data, 'utf-8');
     } else {
-      return reject(new Error('Data after transformation must be a string or an ArrayBuffer'));
+      return reject(new Error('Data after transformation must be a string, an ArrayBuffer, or a Stream'));
     }
 
     // Add Content-Length header if data exists
@@ -93,39 +100,37 @@ module.exports = function httpAdapter(resolve, reject, config) {
       break;
     }
 
-    var responseBuffer = [];
-    stream.on('data', function handleStreamData(chunk) {
-      responseBuffer.push(chunk);
+    var response = {
+      status: res.statusCode,
+      statusText: res.statusMessage,
+      headers: res.headers,
+      config: config,
+      request: req
+    };
 
-      // make sure the content length is not over the maxContentLength if specified
-      if (config.maxContentLength > -1 && Buffer.concat(responseBuffer).length > config.maxContentLength) {
-        reject(new Error('maxContentLength size of ' + config.maxContentLength + ' exceeded'));
-      }
-    });
+    if (config.responseType === 'stream') {
+      response.data = stream;
+      settle(resolve, reject, response);
+    } else {
+      var responseBuffer = [];
+      stream.on('data', function handleStreamData(chunk) {
+        responseBuffer.push(chunk);
 
-    stream.on('end', function handleStreamEnd() {
-      var d = Buffer.concat(responseBuffer);
-      if (config.responseType !== 'arraybuffer') {
-        d = d.toString('utf8');
-      }
-      var response = {
-        data: transformData(
-          d,
-          res.headers,
-          config.transformResponse
-        ),
-        status: res.statusCode,
-        statusText: res.statusMessage,
-        headers: res.headers,
-        config: config,
-        request: req
-      };
+        // make sure the content length is not over the maxContentLength if specified
+        if (config.maxContentLength > -1 && Buffer.concat(responseBuffer).length > config.maxContentLength) {
+          reject(new Error('maxContentLength size of ' + config.maxContentLength + ' exceeded'));
+        }
+      });
 
-      // Resolve or reject the Promise based on the status
-      (res.statusCode >= 200 && res.statusCode < 300 ?
-        resolve :
-        reject)(response);
-    });
+      stream.on('end', function handleStreamEnd() {
+        var responseData = Buffer.concat(responseBuffer);
+        if (config.responseType !== 'arraybuffer') {
+          responseData = responseData.toString('utf8');
+        }
+        response.data = transformData(responseData, res.headers, config.transformResponse);
+        settle(resolve, reject, response);
+      });
+    }
   });
 
   // Handle errors
@@ -147,5 +152,9 @@ module.exports = function httpAdapter(resolve, reject, config) {
   }
 
   // Send the request
-  req.end(data);
+  if (utils.isStream(data)) {
+    data.pipe(req);
+  } else {
+    req.end(data);
+  }
 };
diff --git a/lib/defaults.js b/lib/defaults.js
index 45910c8..6bbfcbf 100644
--- a/lib/defaults.js
+++ b/lib/defaults.js
@@ -8,11 +8,8 @@ var DEFAULT_CONTENT_TYPE = {
 };
 
 module.exports = {
-  transformRequest: [function transformRequestJSON(data, headers) {
-    if (utils.isFormData(data)) {
-      return data;
-    }
-    if (utils.isArrayBuffer(data)) {
+  transformRequest: [function transformRequest(data, headers) {
+    if (utils.isFormData(data) || utils.isArrayBuffer(data) || utils.isStream(data)) {
       return data;
     }
     if (utils.isArrayBufferView(data)) {
@@ -36,7 +33,7 @@ module.exports = {
     return data;
   }],
 
-  transformResponse: [function transformResponseJSON(data) {
+  transformResponse: [function transformResponse(data) {
     /*eslint no-param-reassign:0*/
     if (typeof data === 'string') {
       data = data.replace(PROTECTION_PREFIX, '');
diff --git a/test/unit/adapters/http.js b/test/unit/adapters/http.js
index b7f2086..acd0b30 100644
--- a/test/unit/adapters/http.js
+++ b/test/unit/adapters/http.js
@@ -2,6 +2,7 @@ var axios = require('../../../index');
 var http = require('http');
 var url = require('url');
 var zlib = require('zlib');
+var fs = require('fs');
 var server;
 
 module.exports = {
@@ -127,7 +128,7 @@ module.exports = {
       });
     });
   },
-  
+
   testMaxContentLength: function(test) {
     var str = Array(100000).join('ж');
 
@@ -145,7 +146,7 @@ module.exports = {
         error = res;
         failure = true;
       });
-      
+
       setTimeout(function () {
         test.equal(success, false, 'request should not succeed');
         test.equal(failure, true, 'request should fail');
@@ -153,5 +154,26 @@ module.exports = {
         test.done();
       }, 100);
     });
+  },
+
+  testStream: function(test) {
+    server = http.createServer(function (req, res) {
+      req.pipe(res);
+    }).listen(4444, function () {
+      axios.post('http://localhost:4444/',
+        fs.createReadStream(__filename), {
+        responseType: 'stream'
+      }).then(function (res) {
+        var stream = res.data;
+        var string = '';
+        stream.on('data', function (chunk) {
+          string += chunk.toString('utf8');
+        });
+        stream.on('end', function () {
+          test.equal(string, fs.readFileSync(__filename, 'utf8'));
+          test.done();
+        });
+      });
+    });
   }
 };