diff --git a/watson_developer_cloud/speech_to_text_v1.py b/watson_developer_cloud/speech_to_text_v1.py
index e849ad67..c2f717a6 100644
--- a/watson_developer_cloud/speech_to_text_v1.py
+++ b/watson_developer_cloud/speech_to_text_v1.py
@@ -118,7 +118,7 @@ class SpeechToTextV1(WatsonDeveloperCloudService):
 
         headers = {'Content-Type': 'application/octet-stream'}
 
-        return self.request(method='GET',
+        return self.request(method='POST',
                             url=url.format(customization_id,
                                            corpus_name),
                             headers=headers,

SpeechToTextV1.add_corpus() uses wrong http method (GET, should use POST)
Currently, using `add_corpus` will break with a `WatsonException: Unknown error` error. This is due to the method using the wrong HTTP method (GET, instead of POST). The tests don't catch this because the assertion in `test_custom_corpora` only checks the number of requests made and not the details of those requests.

I have a patch that should be ready soon.
diff --git a/test/test_speech_to_text_v1.py b/test/test_speech_to_text_v1.py
index 2334f4b5..3153dcdf 100755
--- a/test/test_speech_to_text_v1.py
+++ b/test/test_speech_to_text_v1.py
@@ -106,49 +106,48 @@ def test_custom_model():
 
     assert len(responses.calls) == 5
 
-@responses.activate
 def test_custom_corpora():
 
     corpora_url = 'https://stream.watsonplatform.net/speech-to-text/api/v1/customizations/{0}/corpora'
     get_corpora_url = '{0}/{1}'.format(corpora_url.format('customid'),'corpus')
 
-    responses.add(responses.GET, corpora_url.format('customid'),
-                  body='{"get response": "yep"}', status=200,
-                  content_type='application/json')
+    with responses.RequestsMock(assert_all_requests_are_fired=True) as rsps:
+        rsps.add(responses.GET, corpora_url.format('customid'),
+                 body='{"get response": "yep"}', status=200,
+                 content_type='application/json')
 
-    responses.add(responses.POST, get_corpora_url,
+        rsps.add(responses.POST, get_corpora_url,
                  body='{"get response": "yep"}',
                  status=200,
                  content_type='application/json')
 
-    responses.add(responses.GET, get_corpora_url,
+        rsps.add(responses.GET, get_corpora_url,
                  body='{"get response": "yep"}',
                  status=200,
                  content_type='application/json')
 
-    responses.add(responses.DELETE, get_corpora_url,
-                  body='{"get response": "yep"}',
-                  status=200,
-                  content_type='application/json')
+        rsps.add(responses.DELETE, get_corpora_url,
+                 body='{"get response": "yep"}',
+                 status=200,
+                 content_type='application/json')
 
-    speech_to_text = watson_developer_cloud.SpeechToTextV1(
-        username="username", password="password")
+        speech_to_text = watson_developer_cloud.SpeechToTextV1(
+            username="username", password="password")
 
-    speech_to_text.list_corpora(customization_id='customid')
+        speech_to_text.list_corpora(customization_id='customid')
 
-    file_path = '../resources/speech_to_text/corpus-short-1.txt'
-    full_path = os.path.join(os.path.dirname(__file__), file_path)
-    with open(full_path) as corpus_file:
-        speech_to_text.add_corpus(customization_id='customid',
-                                  corpus_name="corpus", file_data=corpus_file)
+        file_path = '../resources/speech_to_text/corpus-short-1.txt'
+        full_path = os.path.join(os.path.dirname(__file__), file_path)
+        with open(full_path) as corpus_file:
+            speech_to_text.add_corpus(customization_id='customid',
+                                      corpus_name="corpus", file_data=corpus_file)
 
-    speech_to_text.get_corpus(customization_id='customid',
-                              corpus_name='corpus')
+        speech_to_text.get_corpus(customization_id='customid',
+                                  corpus_name='corpus')
 
-    speech_to_text.delete_corpus(customization_id='customid',
-                                 corpus_name='corpus')
+        speech_to_text.delete_corpus(customization_id='customid',
+                                     corpus_name='corpus')
 
-    assert len(responses.calls) == 4
 
 @responses.activate
 def test_custom_words():

pip install -e .
parse_log_pytest
requirements.txt
pytest responses python_dotenv
3.6
requirements.txt
pytest --no-header -rA --tb=line --color=no -p no:cacheprovider -W ignore::DeprecationWarning
attrs==22.2.0
certifi==2021.5.30
cffi==1.15.1
charset-normalizer==2.0.12
cryptography==40.0.2
idna==3.10
importlib-metadata==4.8.3
iniconfig==1.1.1
packaging==21.3
pluggy==1.0.0
py==1.11.0
pycparser==2.21
pyOpenSSL==23.2.0
pyparsing==3.1.4
pysolr==3.10.0
pytest==7.0.1
python-dotenv==0.20.0
requests==2.27.1
responses==0.17.0
six==1.17.0
tomli==1.2.3
typing_extensions==4.1.1
urllib3==1.26.20
-e git+https://github.com/watson-developer-cloud/python-sdk.git@13290dc52276d56ec04bf4eb19f21669d8ca3828#egg=watson_developer_cloud
zipp==3.6.0

name: python-sdk
channels:
  - defaults
  - https://repo.anaconda.com/pkgs/main
  - https://repo.anaconda.com/pkgs/r
  - conda-forge
dependencies:
  - _libgcc_mutex=0.1=main
  - _openmp_mutex=5.1=1_gnu
  - ca-certificates=2025.2.25=h06a4308_0
  - certifi=2021.5.30=py36h06a4308_0
  - ld_impl_linux-64=2.40=h12ee557_0
  - libffi=3.3=he6710b0_2
  - libgcc-ng=11.2.0=h1234567_1
  - libgomp=11.2.0=h1234567_1
  - libstdcxx-ng=11.2.0=h1234567_1
  - ncurses=6.4=h6a678d5_0
  - openssl=1.1.1w=h7f8727e_0
  - pip=21.2.2=py36h06a4308_0
  - python=3.6.13=h12debd9_1
  - readline=8.2=h5eee18b_0
  - setuptools=58.0.4=py36h06a4308_0
  - sqlite=3.45.3=h5eee18b_0
  - tk=8.6.14=h39e8969_0
  - wheel=0.37.1=pyhd3eb1b0_0
  - xz=5.6.4=h5eee18b_1
  - zlib=1.2.13=h5eee18b_1
  - pip:
      - argparse==1.4.0
      - attrs==22.2.0
      - cffi==1.15.1
      - charset-normalizer==2.0.12
      - cryptography==40.0.2
      - idna==3.10
      - importlib-metadata==4.8.3
      - iniconfig==1.1.1
      - packaging==21.3
      - pluggy==1.0.0
      - py==1.11.0
      - pycparser==2.21
      - pyopenssl==23.2.0
      - pyparsing==3.1.4
      - pysolr==3.10.0
      - pytest==7.0.1
      - python-dotenv==0.20.0
      - requests==2.27.1
      - responses==0.17.0
      - six==1.17.0
      - tomli==1.2.3
      - typing-extensions==4.1.1
      - urllib3==1.26.20
      - zipp==3.6.0
prefix: /opt/conda/envs/python-sdk

test/test_speech_to_text_v1.py::test_custom_corpora
test/test_speech_to_text_v1.py::test_success test/test_speech_to_text_v1.py::test_get_model test/test_speech_to_text_v1.py::test_custom_model test/test_speech_to_text_v1.py::test_custom_words
watson_developer_cloud/speech_to_text_v1.py
watson_developer_cloud/speech_to_text_v1.py