diff --git a/httpie/cliparse.py b/httpie/cliparse.py
index 226fad66..a0c17bd1 100644
--- a/httpie/cliparse.py
+++ b/httpie/cliparse.py
@@ -384,9 +384,6 @@ def parse_items(items, data=None, headers=None, files=None, params=None):
         else:
             raise ParseError('%s is not valid item' % item.orig)
 
-        if key in target:
-            ParseError('duplicate item %s (%s)' % (item.key, item.orig))
-
         target[key] = value
 
     return headers, data, files, params
diff --git a/httpie/models.py b/httpie/models.py
index 0aa2209d..51324818 100644
--- a/httpie/models.py
+++ b/httpie/models.py
@@ -63,36 +63,53 @@ class HTTPMessage(object):
     @staticmethod
     def from_request(request):
         """Make an `HTTPMessage` from `requests.models.Request`."""
-        url = urlparse(request.url)
-        request_headers = dict(request.headers)
-        if 'Host' not in request_headers:
-            request_headers['Host'] = url.netloc
 
+        url = urlparse(request.url)
+
+        # Querystring
+        qs = ''
+        if url.query or request.params:
+            qs = '?'
+            if url.query:
+                qs += url.query
+            # Requests doesn't make params part of ``request.url``.
+            if request.params:
+                if url.query:
+                    qs += '&'
+                qs += type(request)._encode_params(request.params)
+
+        # Request-Line
+        request_line = '{method} {path}{query} HTTP/1.1'.format(
+            method=request.method,
+            path=url.path or '/',
+            query=qs
+        )
+
+        # Headers
+        headers = dict(request.headers)
+        content_type = headers.get('Content-Type')
+        if 'Host' not in headers:
+            headers['Host'] = url.netloc
+        headers = '\n'.join(
+            str('%s: %s') % (name, value)
+            for name, value
+            in headers.items()
+        )
+
+        # Body
         try:
             body = request.data
         except AttributeError:
             # requests < 0.12.1
             body = request._enc_data
-
         if isinstance(body, dict):
-            # --form
-            body = request.__class__._encode_params(body)
+            body = type(request)._encode_params(body)
 
-        request_line = '{method} {path}{query} HTTP/1.1'.format(
-            method=request.method,
-            path=url.path or '/',
-            query='' if url.query is '' else '?' + url.query
-        )
-        headers = '\n'.join(
-            str('%s: %s') % (name, value)
-            for name, value
-            in request_headers.items()
-        )
         return HTTPMessage(
             line=request_line,
             headers=headers,
             body=body,
-            content_type=request_headers.get('Content-Type')
+            content_type=content_type
         )
 
     @classmethod
diff --git a/tests/tests.py b/tests/tests.py
index e5d238de..0dbf31c5 100755
--- a/tests/tests.py
+++ b/tests/tests.py
@@ -107,8 +107,10 @@ def http(*args, **kwargs):
             except ValueError:
                 pass
             else:
-                r.strip().index('\n')
-                r.json = json.loads(j)
+                try:
+                    r.json = json.loads(j)
+                except ValueError:
+                    pass
 
     return r
 
@@ -217,6 +219,56 @@ class HTTPieTest(BaseTestCase):
         self.assertIn('"Foo": "bar"', r)
 
 
+class QuerystringTest(BaseTestCase):
+
+    def test_query_string_params_in_url(self):
+        r = http(
+            '--print=Hhb',
+            'GET',
+            httpbin('/get?a=1&b=2')
+        )
+
+        path = '/get?a=1&b=2'
+        url = httpbin(path)
+
+        self.assertIn('HTTP/1.1 200', r)
+        self.assertIn('GET %s HTTP/1.1' % path, r)
+        self.assertIn('"url": "%s"' % url, r)
+
+    def test_query_string_params_items(self):
+        r = http(
+            '--print=Hhb',
+            'GET',
+            httpbin('/get'),
+            'a==1',
+            'b==2'
+        )
+
+        path = '/get?a=1&b=2'
+        url = httpbin(path)
+
+        self.assertIn('HTTP/1.1 200', r)
+        self.assertIn('GET %s HTTP/1.1' % path, r)
+        self.assertIn('"url": "%s"' % url, r)
+
+    def test_query_string_params_in_url_and_items_with_duplicates(self):
+        r = http(
+            '--print=Hhb',
+            'GET',
+            httpbin('/get?a=1&a=1'),
+            'a==1',
+            'a==1',
+            'b==2',
+        )
+
+        path = '/get?a=1&a=1&a=1&a=1&b=2'
+        url = httpbin(path)
+
+        self.assertIn('HTTP/1.1 200', r)
+        self.assertIn('GET %s HTTP/1.1' % path, r)
+        self.assertIn('"url": "%s"' % url, r)
+
+
 class AutoContentTypeAndAcceptHeadersTest(BaseTestCase):
     """
     Test that Accept and Content-Type correctly defaults to JSON,