diff --git a/CHANGES.rst b/CHANGES.rst
index bf4ed82..613a7d0 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,14 @@
 Change History
 **************
 
+0.6.7 (2020-03-10)
+==================
+
+Changes:
+
+* Fixed passing Path objects (#169)
+* Trying to guess mime type of inputs rather than taking the first value (#171)
+
 0.6.6 (2020-03-03)
 ==================
 
diff --git a/birdy/client/base.py b/birdy/client/base.py
index d220a83..9bbf39f 100644
--- a/birdy/client/base.py
+++ b/birdy/client/base.py
@@ -11,7 +11,7 @@ from owslib.wps import WPS_DEFAULT_VERSION, WebProcessingService, SYNC, ASYNC, C
 
 from birdy.exceptions import UnauthorizedException
 from birdy.client import utils
-from birdy.utils import sanitize, fix_url, embed
+from birdy.utils import sanitize, fix_url, embed, guess_type
 from birdy.client import notebook
 from birdy.client.outputs import WPSResult
 
@@ -243,21 +243,35 @@ class WPSClient(object):
                 continue
 
             values = [arg, ] if not isinstance(arg, (list, tuple)) else arg
+            supported_mimetypes = [v.mimeType for v in input_param.supportedValues]
 
             for value in values:
+                #  if input_param.dataType == "ComplexData": seems simpler
                 if isinstance(input_param.defaultValue, ComplexData):
-                    encoding = input_param.defaultValue.encoding
-                    mimetype = input_param.defaultValue.mimeType
+
+                    # Guess the mimetype of the input value
+                    mimetype, encoding = guess_type(value)
+
+                    # If unrecognized, default to the first supported mimetype
+                    if mimetype is None:
+                        mimetype = supported_mimetypes[0]
+                    else:
+                        if mimetype not in supported_mimetypes:
+                            raise ValueError(f"mimetype {mimetype} not in supported mimetypes {supported_mimetypes}.")
+
+                    if encoding is None:
+                        encoding = input_param.defaultValue.encoding
 
                     if isinstance(value, ComplexData):
                         inp = value
 
+                    # Either embed the file content or just the reference.
                     else:
                         if utils.is_embedded_in_request(self._wps.url, value):
                             # If encoding is None, this will return the actual encoding used (utf-8 or base64).
                             value, encoding = embed(value, mimetype, encoding=encoding)
                         else:
-                            value = fix_url(value)
+                            value = fix_url(str(value))
 
                         inp = utils.to_owslib(value,
                                               data_type=input_param.dataType,
diff --git a/birdy/utils.py b/birdy/utils.py
index fbdba72..b892acf 100644
--- a/birdy/utils.py
+++ b/birdy/utils.py
@@ -120,3 +120,33 @@ def _encode(content, mimetype, encoding):
             return content, encoding
         # Do we need to escape content that is not HTML safe ?
         # return u'<![CDATA[{}]]>'.format(content)
+
+
+def guess_type(url):
+    """Guess the mime type of the file link.
+
+    Returns
+    -------
+    mimetype, encoding
+    """
+    import mimetypes
+
+    try:
+        mime, enc = mimetypes.guess_type(url, strict=False)
+    except TypeError:
+        mime, enc = None, None
+
+    # Special cases
+    # -------------
+
+    # netCDF
+    if mime == "application/x-netcdf" and "dodsC" in url:
+        mime = "application/x-ogc-dods"
+
+    # application/zip vs application/x-zipped-shp
+    # TODO
+
+    # All the various XML schemes
+    # TODO
+
+    return mime, enc

diff --git a/tests/test_client.py b/tests/test_client.py
index ff2d856..7918613 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -5,7 +5,6 @@ import tempfile
 from pathlib import Path
 from unittest import mock
 import owslib.wps
-
 import pytest
 # from owslib import crs
 
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 98ffa08..5f89691 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -1,6 +1,7 @@
 from birdy import utils
 from .common import resource_file
 from pathlib import Path
+import pytest
 
 
 def test_is_url():
@@ -63,3 +64,11 @@ class TestEncode:
         with open(self.nc, 'rb') as fp:
             nc, enc = utils.embed(fp, 'application/x-netcdf')
             assert isinstance(nc, bytes)
+
+
+@pytest.mark.parametrize("value,expected", [("LSJ_LL.zip", "application/zip"),
+                                            ("https://remote.org/thredds/dodsC/a.nc", "application/x-ogc-dods"),
+                                            ("https://remote.org/thredds/file/a.nc", "application/x-netcdf")])
+def test_guess_type(value, expected):
+    mime, enc = utils.guess_type(value)
+    assert mime == expected

Inputs are given default mimetype
## Description

If an input has multiple supported formats, birdy will always use the first one in the list when creating a request. If an input has to be embedded in the request, and its mimetype is a binary format while the default mimetype is not, it crashes the `embed` function. 

## Environment

* Birdy version used, if any: 0.6.6

tests/test_utils.py::test_guess_type[LSJ_LL.zip-application/zip] tests/test_utils.py::test_guess_type[https://remote.org/thredds/dodsC/a.nc-application/x-ogc-dods] tests/test_utils.py::test_guess_type[https://remote.org/thredds/file/a.nc-application/x-netcdf]
tests/test_client.py::test_sort_inputs tests/test_client.py::test_sort_inputs_conditions tests/test_client.py::test_all_subclasses tests/test_client.py::test_jsonconverter tests/test_client.py::test_zipconverter tests/test_client.py::test_jpeg_imageconverter tests/test_client.py::TestIsEmbedded::test_string tests/test_client.py::TestIsEmbedded::test_file_like tests/test_client.py::TestIsEmbedded::test_local_fn tests/test_client.py::TestIsEmbedded::test_local_path tests/test_client.py::TestIsEmbedded::test_local_uri tests/test_client.py::TestIsEmbedded::test_url tests/test_utils.py::test_is_url tests/test_utils.py::test_is_file tests/test_utils.py::test_sanitize tests/test_utils.py::test_delist tests/test_utils.py::TestEncode::test_str tests/test_utils.py::TestEncode::test_local_fn tests/test_utils.py::TestEncode::test_local_uri tests/test_utils.py::TestEncode::test_path tests/test_utils.py::TestEncode::test_file