urllib3的pip安装挂在“因etag而缓存”。我正在构建一个AWS chalice项目，它不允许您指定--no-cache-dir，所以我需要在没有该命令的情况下解决问题。有任何想法吗？
在虚拟环境中使用Python 3.6.5和Pip 10.0.1。
(partnerdb-virtualenv) C:\Windows\SysWOW64\partnerdb-project>pip install urllib3 -vvv
Config variable 'Py_DEBUG' is unset, Python ABI tag may be incorrect
Config variable 'WITH_PYMALLOC' is unset, Python ABI tag may be incorrect
Created temporary directory: C:\Users\Matt\AppData\Local\Temp\pip-ephem-wheel-cache-v0e8ikpl
Created temporary directory: C:\Users\Matt\AppData\Local\Temp\pip-req-tracker-d58lw_h5
Created requirements tracker 'C:\\Users\\Matt\\AppData\\Local\\Temp\\pip-req-tracker-d58lw_h5'
Created temporary directory: C:\Users\Matt\AppData\Local\Temp\pip-install-6qpv92ms
Collecting urllib3
1 location(s) to search for versions of urllib3:
* https://pypi.org/simple/urllib3/
Getting page https://pypi.org/simple/urllib3/
Looking up "https://pypi.org/simple/urllib3/" in the cache
Request header has "max_age" as 0, cache bypassed
Starting new HTTPS connection (1): pypi.org:443
https://pypi.org:443 "GET /simple/urllib3/ HTTP/1.1" 200 6330
Updating cache with response from "https://pypi.org/simple/urllib3/"
Caching due to etag
编辑：根据其中一条评论，curl -vvv https://files/pythonhosted.org/返回：
* Trying 2a04:4e42:2d::319...
* TCP_NODELAY set
* Connected to files.pythonhosted.org (2a04:4e42:2d::319) port 443 (#0)
* schannel: SSL/TLS connection with files.pythonhosted.org port 443 (step 1/3)
* schannel: checking server certificate revocation
* schannel: sending initial handshake data: sending 187 bytes...
* schannel: sent initial handshake data: sent 187 bytes
* schannel: SSL/TLS connection with files.pythonhosted.org port 443 (step 2/3)
* schannel: failed to receive handshake, need more data
* schannel: SSL/TLS connection with files.pythonhosted.org port 443 (step 2/3)
* schannel: encrypted data got 4096
* schannel: encrypted data buffer: offset 4096 length 4096
* schannel: encrypted data length: 4018
* schannel: encrypted data buffer: offset 4018 length 4096
* schannel: received incomplete message, need more data
* schannel: SSL/TLS connection with files.pythonhosted.org port 443 (step 2/3)
* schannel: encrypted data got 1024
* schannel: encrypted data buffer: offset 5042 length 5042
* schannel: encrypted data length: 815
* schannel: encrypted data buffer: offset 815 length 5042
* schannel: received incomplete message, need more data
* schannel: SSL/TLS connection with files.pythonhosted.org port 443 (step 2/3)
* schannel: encrypted data got 1051
* schannel: encrypted data buffer: offset 1866 length 5042
* schannel: sending next handshake data: sending 93 bytes...
* schannel: SSL/TLS connection with files.pythonhosted.org port 443 (step 2/3)
* schannel: encrypted data got 258
* schannel: encrypted data buffer: offset 258 length 5042
* schannel: SSL/TLS handshake complete
* schannel: SSL/TLS connection with files.pythonhosted.org port 443 (step 3/3)
* schannel: stored credential handle in session cache
> GET / HTTP/1.1
> Host: files.pythonhosted.org
> User-Agent: curl/7.55.1
> Accept: */*
>
* schannel: client wants to read 102400 bytes
* schannel: encdata_buffer resized 103424
* schannel: encrypted data buffer: offset 0 length 103424
* schannel: encrypted data got 2412
* schannel: encrypted data buffer: offset 2412 length 103424
* schannel: decrypted data length: 2383
* schannel: decrypted data added: 2383
* schannel: decrypted data cached: offset 2383 length 102400
* schannel: encrypted data buffer: offset 0 length 103424
* schannel: decrypted data buffer: offset 2383 length 102400
* schannel: schannel_recv cleanup
* schannel: decrypted data returned 2383
* schannel: decrypted data buffer: offset 0 length 102400
< HTTP/1.1 200 OK
< Content-Type: text/html
< Server: nginx/1.13.9
< Content-Length: 1822
< Accept-Ranges: bytes
< Date: Thu, 18 Oct 2018 18:18:01 GMT
< Age: 0
< Connection: keep-alive
< X-Served-By: cache-iad2138-IAD, cache-pao17439-PAO
< X-Cache: HIT, MISS
< X-Cache-Hits: 1, 0
< X-Timer: S1539886682.749014,VS0,VE70
< Vary: Accept-Encoding
< Strict-Transport-Security: max-age=31536000; includeSubDomains; preload
< X-Frame-Options: deny
< X-XSS-Protection: 1; mode=block
< X-Content-Type-Options: nosniff
< X-Permitted-Cross-Domain-Policies: none
< X-Robots-Header: noindex
<
<html> ... </html>
* Connection #0 to host files.pythonhosted.org left intact
长时间和晚期拍摄，但值得尝试：
我的缓存只有一个类似的问题。使用--no-cache-dir一切正常，但这不是一个解决方案。
我找到了this answer，并删除了整个pip缓存，砰！
来自docs：
缓存目录的默认位置取决于操作系统：
Unix的
~/.cache/pip and it respects the XDG_CACHE_HOME directory。MACOS
~/Library/Caches/pip。视窗
<CSIDL_LOCAL_APPDATA>\pip\Cache
使用pip的--no-cache-dir标志来避免此错误。