title: No matching distribution found for multiple packages
body: <p>Suddenly I get a lot of errors while trying to use my previously working (for many months) requirements file.
  I tried to go to the pypi.org and get the same 404 error.</p>
  <p>Is there something wrong with my setup?</p>
  <pre><code>&gt; pip install -r requirements.txt
  Collecting get==2019.4.13 (from -r requirements.txt (line 4))
    Cache entry deserialization failed, entry ignored
  Exception:
  requests.exceptions.HTTPError: 404 Client Error: Not Found for url: https://pypi.org/simple/get/
  </code></pre>
  <p>If I remove line <code>get==2019.4.13</code> next error is:</p>
  <pre><code>&gt; pip install -r requirements.txt
  Collecting post==2019.4.13 (from -r requirements.txt (line 11))
    Cache entry deserialization failed, entry ignored
  Exception:
  requests.exceptions.HTTPError: 404 Client Error: Not Found for url: https://pypi.org/simple/post/
  </code></pre>