I don't think many people use the builtin HttpClient these days. Apache httpclient would be the conservative standard, apparentyl it has some support for 2 but

I don't think many people use the builtin HttpClient these days. Apache httpclient would be the conservative standard, apparentyl it has some support for 2 but not 3: https://hc.apache.org/httpcomponents-client-5.4.x/index.html https://hc.apache.org/httpcomponents-client-5.4.x/index.html .