karabaja4 / legacy-http-client

Legacy C# .NET Framework 4.0 HTTP client for Windows XP SP3 (POSReady2009) with TLS 1.2 support

About

This C# .NET Framework 4.0 HTTP client demonstrates the use of MSXML2.XMLHTTP60 from msxml6.dll to make HTTPS TLS 1.2 calls on Windows XP SP3 (POSReady2009).

An example LHC.App references LHC.Library, which exposes the following method:

Task<LegacyHttpResponse> Send(string method, string url, HttpContent content = null)

The DLL that is referenced by LHC.Library is msxml6.dll, but it should work just as well with msxml3.dll and MSXML2.XMLHTTP.

The library depends on the following Nuget packages:

<package id="Microsoft.Bcl" version="1.1.10" targetFramework="net40" />
<package id="Microsoft.Bcl.Async" version="1.0.168" targetFramework="net40" />
<package id="Microsoft.Bcl.Build" version="1.0.21" targetFramework="net40" />
<package id="Microsoft.Net.Http" version="2.2.29" targetFramework="net40" />
<package id="Newtonsoft.Json" version="13.0.3" targetFramework="net40" />

Prerequisites

Install all updates from https://legacyupdate.net for Windows XP SP3 to enable TLS 1.2 support.

SSL Ciphers

The following ciphers seem to still work:

IANA name	nginx (ssl_ciphers)
TLS_RSA_WITH_AES_256_CBC_SHA256	AES256-SHA256
TLS_RSA_WITH_AES_128_CBC_SHA256	AES128-SHA256
TLS_RSA_WITH_AES_256_CBC_SHA	AES256-SHA
TLS_RSA_WITH_AES_128_CBC_SHA	AES128-SHA

⚠️ Warning: they are all WEAK ciphers.

License

Released under MIT license.