根据istio/istio，我尝试使用master从make build构建https://github.com/istio/istio/wiki/Using-the-Code-Base。当构建脚本尝试下载istio-proxy时，curl退出，错误代码：
...
Downloading Envoy: curl -fLSs https://github.com/istio/proxy/releases/download/1.0.2/istio-proxy-1.0.2-macos.tar.gz to /work/out/darwin_amd64/release/envoy-1.0.2
curl: (60) SSL certificate problem: self signed certificate in certificate chain
More details here: https://curl.haxx.se/docs/sslcerts.html
...
我访问过https://curl.haxx.se/docs/sslcerts.html，下载最新版本cacert.pem并放在/etc/ssl/certs/cacert.pem中。
毕竟我可以手动下载istio-proxy-1.0.2-macos.tar.gz（使用curl）
curl -L https://github.com/istio/proxy/releases/download/1.0.2/istio-proxy-1.0.2-macos.tar.gz --output some-output-file
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 620 100 620 0 0 1383 0 --:--:-- --:--:-- --:--:-- 1383
100 7947k 100 7947k 0 0 631k 0 0:00:12 0:00:12 --:--:-- 1359k
，但是在执行make build期间仍会发生错误。
[将curl与-k一起使用（使用SSL时允许不安全的服务器连接），请获取You are being redirected.：
<html><body>You are being <a href="https://github-production-release-asset-2e65be.s3.amazonaws.com/75322405/f13ffa80-b53b-11e8-9527-2a586cbda4ad?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIWNJYAX4CSVEH53A%2F20200304%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200304T111428Z&X-Amz-Expires=300&X-Amz-Signature=73a2788ecc120b520a6ddeb237b8bbd74a035f71e3aed8f5ee2de6f463abf3fc&X-Amz-SignedHeaders=host&actor_id=0&response-content-disposition=attachment%3B%20filename%3Distio-proxy-1.0.2-macos.tar.gz&response-content-type=application%2Foctet-stream">redirected</a>.</body></html>
OS：macOS Catalina 10.15.1
tmp解决方案 ->将-k选项添加到
...
if command -v curl > /dev/null; then
if curl --version | grep Protocols | grep https > /dev/null; then
DOWNLOAD_COMMAND='curl -kfLSs'
return
...
到bin/init.sh =>使用DOWNLOAD_COMMAND的地方，使用不安全的连接。
我知道这是个坏主意...