title: ERROR: Could not find a version that satisfies the requirement fastapi (from versions: none)
body: <p>I am setting up a python environment on my laptop which is behind a corporate firewall. After getting all the proxy settings fixed, I was able to use virtualenv to create an environment. I then tested by installing fastapi and uvicorn. That went well until I created a new virtualenv in another folder and now I get the error</p>
  <pre><code>ERROR: Could not find a version that satisfies the requirement fastapi (from versions: none)
  
  ERROR: No matching distribution found for fastapi
  </code></pre>
  <p>It seems that I get the error for some packages and not others. For example install <code>pip install flask</code> works just fine. If I then try to install flask in another environment I get the same error.</p>
  <p>My Python Version: Python 3.8.3</p>
  <p>My pip version: pip 20.2.3</p>
  <p>OS: Windows 10</p>
  <p>Below I have the failed results for fastapi and below that the successful result of installing python-dotenv, which I had not instlled before.</p>
  <p>Here is the verbose output of trying to install fastapi</p>
  <pre><code> pip -v install --proxy http://10.108.19.5:3128 fastapi
  Using pip 20.2.3 from C:\dev\api_microserver_experiment\erp_microservices\ifs2004_api\lib\site-packages\pip (python 3.8)
  Non-user install because user site-packages disabled
  Created temporary directory: C:\Users\simon.carr2\AppData\Local\Temp\pip-ephem-wheel-cache-ocbqxum9
  Created temporary directory: C:\Users\simon.carr2\AppData\Local\Temp\pip-req-tracker-7zbqpgxd
  Initialized build tracking at C:\Users\simon.carr2\AppData\Local\Temp\pip-req-tracker-7zbqpgxd
  Created build tracker: C:\Users\simon.carr2\AppData\Local\Temp\pip-req-tracker-7zbqpgxd
  Entered build tracker: C:\Users\simon.carr2\AppData\Local\Temp\pip-req-tracker-7zbqpgxd
  Created temporary directory: C:\Users\simon.carr2\AppData\Local\Temp\pip-install-ozn8129j
  1 location(s) to search for versions of fastapi:
  * https://pypi.org/simple/fastapi/
  Fetching project page and analyzing links: https://pypi.org/simple/fastapi/
  Getting page https://pypi.org/simple/fastapi/
  Found index url https://pypi.org/simple
  Looking up &quot;https://pypi.org/simple/fastapi/&quot; in the cache
  Request header has &quot;max_age&quot; as 0, cache bypassed
  Starting new HTTPS connection (1): pypi.org:443
  https://pypi.org:443 &quot;GET /simple/fastapi/ HTTP/1.1&quot; 500 655
  Incremented Retry for (url='/simple/fastapi/'): Retry(total=4, connect=None, read=None, redirect=None, status=None)
  Retry: /simple/fastapi/
  Resetting dropped connection: pypi.org
  Starting new HTTPS connection (2): pypi.org:443
  https://pypi.org:443 &quot;GET /simple/fastapi/ HTTP/1.1&quot; 500 655
  Incremented Retry for (url='/simple/fastapi/'): Retry(total=3, connect=None, read=None, redirect=None, status=None)
  Retry: /simple/fastapi/
  Resetting dropped connection: pypi.org
  Starting new HTTPS connection (3): pypi.org:443
  https://pypi.org:443 &quot;GET /simple/fastapi/ HTTP/1.1&quot; 500 655
  Incremented Retry for (url='/simple/fastapi/'): Retry(total=2, connect=None, read=None, redirect=None, status=None)
  Retry: /simple/fastapi/
  Resetting dropped connection: pypi.org
  Starting new HTTPS connection (4): pypi.org:443
  https://pypi.org:443 &quot;GET /simple/fastapi/ HTTP/1.1&quot; 500 655
  Incremented Retry for (url='/simple/fastapi/'): Retry(total=1, connect=None, read=None, redirect=None, status=None)
  Retry: /simple/fastapi/
  Resetting dropped connection: pypi.org
  Starting new HTTPS connection (5): pypi.org:443
  https://pypi.org:443 &quot;GET /simple/fastapi/ HTTP/1.1&quot; 500 655
  Incremented Retry for (url='/simple/fastapi/'): Retry(total=0, connect=None, read=None, redirect=None, status=None)
  Retry: /simple/fastapi/
  Resetting dropped connection: pypi.org
  Starting new HTTPS connection (6): pypi.org:443
  https://pypi.org:443 &quot;GET /simple/fastapi/ HTTP/1.1&quot; 500 655
  Could not fetch URL https://pypi.org/simple/fastapi/: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/fastapi/ (Caused by ResponseError('too many 500 error responses')) - skipping
  Given no hashes to check 0 links for project 'fastapi': discarding no candidates
  ERROR: Could not find a version that satisfies the requirement fastapi (from versions: none)
  ERROR: No matching distribution found for fastapi
  Exception information:
  Traceback (most recent call last):
    File &quot;C:\dev\api_microserver_experiment\erp_microservices\ifs2004_api\lib\site-packages\pip\_internal\cli\base_command.py&quot;, line 228, in _main
      status = self.run(options, args)
    File &quot;C:\dev\api_microserver_experiment\erp_microservices\ifs2004_api\lib\site-packages\pip\_internal\cli\req_command.py&quot;, line 182, in wrapper
      return func(self, options, args)
    File &quot;C:\dev\api_microserver_experiment\erp_microservices\ifs2004_api\lib\site-packages\pip\_internal\commands\install.py&quot;, line 323, in run
      requirement_set = resolver.resolve(
    File &quot;C:\dev\api_microserver_experiment\erp_microservices\ifs2004_api\lib\site-packages\pip\_internal\resolution\legacy\resolver.py&quot;, line 183, in resolve
      discovered_reqs.extend(self._resolve_one(requirement_set, req))
    File &quot;C:\dev\api_microserver_experiment\erp_microservices\ifs2004_api\lib\site-packages\pip\_internal\resolution\legacy\resolver.py&quot;, line 388, in _resolve_one
      abstract_dist = self._get_abstract_dist_for(req_to_install)
    File &quot;C:\dev\api_microserver_experiment\erp_microservices\ifs2004_api\lib\site-packages\pip\_internal\resolution\legacy\resolver.py&quot;, line 339, in _get_abstract_dist_for
      self._populate_link(req)
    File &quot;C:\dev\api_microserver_experiment\erp_microservices\ifs2004_api\lib\site-packages\pip\_internal\resolution\legacy\resolver.py&quot;, line 305, in _populate_link
      req.link = self._find_requirement_link(req)
    File &quot;C:\dev\api_microserver_experiment\erp_microservices\ifs2004_api\lib\site-packages\pip\_internal\resolution\legacy\resolver.py&quot;, line 270, in _find_requirement_link
      best_candidate = self.finder.find_requirement(req, upgrade)
    File &quot;C:\dev\api_microserver_experiment\erp_microservices\ifs2004_api\lib\site-packages\pip\_internal\index\package_finder.py&quot;, line 926, in find_requirement
      raise DistributionNotFound(
  pip._internal.exceptions.DistributionNotFound: No matching distribution found for fastapi
  1 location(s) to search for versions of pip:
  * https://pypi.org/simple/pip/
  Fetching project page and analyzing links: https://pypi.org/simple/pip/
  Getting page https://pypi.org/simple/pip/
  Found index url https://pypi.org/simple
  Looking up &quot;https://pypi.org/simple/pip/&quot; in the cache
  Request header has &quot;max_age&quot; as 0, cache bypassed
  Starting new HTTPS connection (1): pypi.org:443
  https://pypi.org:443 &quot;GET /simple/pip/ HTTP/1.1&quot; 500 655
  Could not fetch URL https://pypi.org/simple/pip/: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/pip/ (Caused by ResponseError('too many 500 error responses')) - skipping
  Given no hashes to check 0 links for project 'pip': discarding no candidates
  Removed build tracker: 'C:\\Users\\simon.carr2\\AppData\\Local\\Temp\\pip-req-tracker-7zbqpgxd'
  </code></pre>
  <h1>and if I install something I have not installed before it works.</h1>
  <pre><code>pip -v install --proxy http://10.108.19.5:3128 python-dotenv
  Using pip 20.2.3 from C:\dev\api_microserver_experiment\erp_microservices\ifs2004_api\lib\site-packages\pip (python 3.8)
  Non-user install because user site-packages disabled
  Created temporary directory: C:\Users\simon.carr2\AppData\Local\Temp\pip-ephem-wheel-cache-3n6r96jd
  Created temporary directory: C:\Users\simon.carr2\AppData\Local\Temp\pip-req-tracker-hxciblsu
  Initialized build tracking at C:\Users\simon.carr2\AppData\Local\Temp\pip-req-tracker-hxciblsu
  Created build tracker: C:\Users\simon.carr2\AppData\Local\Temp\pip-req-tracker-hxciblsu
  Entered build tracker: C:\Users\simon.carr2\AppData\Local\Temp\pip-req-tracker-hxciblsu
  Created temporary directory: C:\Users\simon.carr2\AppData\Local\Temp\pip-install-jhqdyshv
  1 location(s) to search for versions of python-dotenv:
  * https://pypi.org/simple/python-dotenv/
  Fetching project page and analyzing links: https://pypi.org/simple/python-dotenv/
  Getting page https://pypi.org/simple/python-dotenv/
  Found index url https://pypi.org/simple
  Looking up &quot;https://pypi.org/simple/python-dotenv/&quot; in the cache
  Request header has &quot;max_age&quot; as 0, cache bypassed
  Starting new HTTPS connection (1): pypi.org:443
  https://pypi.org:443 &quot;GET /simple/python-dotenv/ HTTP/1.1&quot; 200 None
  Updating cache with response from &quot;https://pypi.org/simple/python-dotenv/&quot;
  Caching b/c date exists and max-age &gt; 0
    Found link https://files.pythonhosted.org/packages/ad/3b/16a207ced20a1be0cc2ec5a53ab68ce1976ad643fe7f135d3addd763abf0/python-dotenv-0.1.0.tar.gz#sha256=26156022355d4457bc9062bcead7fde4824623d4463488b623bdd5ce912462fa (from https://pypi.org/simple/python-dotenv/), version: 0.1.0
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  </code></pre>