可能解决方案：WARNING:Retrying (Retry(total=4...after connection broken by ‘SSLError...|Could not fetch URL
首先说一下背景：我是在服务器里面跑项目，然后服务器网络的话用的代理proxy
一、下面是我遇到的错误
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1131)'))': /simple/transformers/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1131)'))': /simple/transformers/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1131)'))': /simple/transformers/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1131)'))': /simple/transformers/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1131)'))': /simple/transformers/
Could not fetch URL https://pypi.org/simple/transformers/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/transformers/ (Caused by SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1131)'))) - skipping
ERROR: Could not find a version that satisfies the requirement transformers (from versions: none)
ERROR: No matching distribution found for transformers
Could not fetch URL https://pypi.org/simple/pip/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/pip/ (Caused by SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1131)'))) - skipping
错误来源于命令
pip install PackageName
同样地，错误也出现在conda上。
随后，我惊奇的发现，只有在我所创的环境里下载包才会有这样的问题，在base环境里完全可以下载包，一点问题都没有！！！
遇到的第二个问题：大概就是说，有时候pip不行 要用conda 而且可能还要在后面加-c pytorch
今天就是这样，最后成功的命令是
conda install pytorch=1.10.0 torchvision=0.11.1 cudatoolkit=10.2 -c pytorch
不加**-c pytorch**会报错，用 pip 好像也会报错，挺奇怪的，先记录记录吧。
二、解决思路
关于这个问题，网上主要有两种解决思路。
第一种，也就是使用镜像的方式（✘）
pip install PackageName -i xxx --trusted-host xxx
这类型的解决办法我就没成功解决过这类问题（服务器端）！
第二种，用export重新设置一次http代理 （✔）
下面是我之前用的
export http_proxy="http://xx.xx.xx.xx:xxxx"
export https_proxy="https://xx.xx.xx.xx:xxxx"
下面是我现在用的
export http_proxy="http://xx.xx.xx.xx:xxxx"
export https_proxy="http://xx.xx.xx.xx:xxxx"
注意看区别！
改了export后，问题成功被解决！