Remove requests as dependency (#26083)

Summary:
local build is slow... test in CI...
Pull Request resolved: https://github.com/pytorch/pytorch/pull/26083

Differential Revision: D17346949

Pulled By: ailzhang

fbshipit-source-id: f552d1a4be55ad4e2bd915af7c5a2c1b6667c446

.jenkins/caffe2/test.sh

@@ -104,10 +104,6 @@ if [[ "$BUILD_ENVIRONMENT" == *py3* ]]; then
   export LANG=C.UTF-8
 fi
 
-if [[ "$BUILD_ENVIRONMENT" == *py2* ]]; then
-  pip install --user requests
-fi
-
 pip install --user pytest-sugar
 "$PYTHON" \
   -m pytest \

.jenkins/pytorch/test.sh

@@ -56,8 +56,6 @@ if [[ "$BUILD_ENVIRONMENT" != *ppc64le* ]]; then
   pip_install --user mypy || true
 fi
 
-pip_install --user requests
-
 # faulthandler become built-in since 3.3
 if [[ ! $(python -c "import sys; print(int(sys.version_info >= (3, 3)))") == "1" ]]; then
   pip_install --user faulthandler

README.md

@@ -169,7 +169,7 @@ If you are building for NVIDIA's Jetson platforms (Jetson Nano, TX1, TX2, AGX Xa
 
 Common
 ```
-conda install numpy ninja pyyaml mkl mkl-include setuptools cmake cffi typing requests
+conda install numpy ninja pyyaml mkl mkl-include setuptools cmake cffi typing
 ```
 
 On Linux

setup.py

@@ -352,9 +352,6 @@ install_requires = []
 if sys.version_info <= (2, 7):
     install_requires += ['future']
 
-if sys.version_info[0] == 2:
-    install_requires += ['requests']
-
 missing_pydep = '''
 Missing build dependency: Unable to `import {importname}`.
 Please install it via `conda install {module}` or `pip install {module}`

torch/hub.py

@@ -12,7 +12,7 @@ import zipfile
 
 if sys.version_info[0] == 2:
     from urlparse import urlparse
-    import requests
+    from urllib2 import urlopen  # noqa f811
 else:
     from urllib.request import urlopen
     from urllib.parse import urlparse  # noqa: F401
@@ -95,10 +95,7 @@ def _download_archive_zip(url, filename):
     sys.stderr.write('Downloading: \"{}\" to {}\n'.format(url, filename))
     # We use a different API for python2 since urllib(2) doesn't recognize the CA
     # certificates in older Python
-    if sys.version_info[0] == 2:
-        response = requests.get(url, stream=True).raw
-    else:
-        response = urlopen(url)
+    response = urlopen(url)
     with open(filename, 'wb') as f:
         while True:
             data = response.read(READ_DATA_CHUNK)
@@ -376,22 +373,14 @@ def _download_url_to_file(url, dst, hash_prefix, progress):
     file_size = None
     # We use a different API for python2 since urllib(2) doesn't recognize the CA
     # certificates in older Python
-    if sys.version_info[0] == 2:
-        response = requests.get(url, stream=True)
-
-        content_length = response.headers['Content-Length']
-        file_size = int(content_length)
-        u = response.raw
+    u = urlopen(url)
+    meta = u.info()
+    if hasattr(meta, 'getheaders'):
+        content_length = meta.getheaders("Content-Length")
     else:
-        u = urlopen(url)
-
-        meta = u.info()
-        if hasattr(meta, 'getheaders'):
-            content_length = meta.getheaders("Content-Length")
-        else:
-            content_length = meta.get_all("Content-Length")
-        if content_length is not None and len(content_length) > 0:
-            file_size = int(content_length[0])
+        content_length = meta.get_all("Content-Length")
+    if content_length is not None and len(content_length) > 0:
+        file_size = int(content_length[0])
 
     # We deliberately save it in a temp file and move it after
     # download is complete. This prevents a local working checkpoint