Unity problem with HTTPS

unity_https_problem.md

Another problem I faced with while development of Unity plugin is Exception while HTTP request from the iOS platform. It produces such stacktrace:

ExecutionEngineException: Attempting to JIT compile method 'System.Reflection.MonoProperty:GetterAdapterFrame<Mono.Security.Protocol.Tls.HttpsClientStream, bool> (System.Reflection.MonoProperty/Getter`2<Mono.Security.Protocol.Tls.HttpsClientStream, bool>,object)' while running with --aot-only.

  at System.Reflection.MonoProperty.GetValue (System.Object obj, System.Object[] index) [0x00000] in <filename unknown>:0 
  at System.Net.WebConnection.Write (System.Net.HttpWebRequest request, System.Byte[] buffer, Int32 offset, Int32 size, System.String& err_msg) [0x00000] in <filename unknown>:0 
  at System.Net.WebConnectionStream.WriteHeaders () [0x00000] in <filename unknown>:0 
  at System.Net.WebConnectionStream.SetHeaders (System.Byte[] buffer) [0x00000] in <filename unknown>:0 
  at System.Net.HttpWebRequest.SendRequestHeaders (Boolean propagate_error) [0x00000] in <filename unknown>:0 
Rethrow as AIServiceException: Attempting to JIT compile method 'System.Reflection.MonoProperty:GetterAdapterFrame<Mono.Security.Protocol.Tls.HttpsClientStream, bool> (System.Reflection.MonoProperty/Getter`2<Mono.Security.Protocol.Tls.HttpsClientStream, bool>,object)' while running with --aot-only.

System.Net.WebConnection.Write method uses some reflection methods. Quick search led me to this answer. But the highlighted answer suggests very complicated solution. So, the another solution, that I found was to select "Api Compatibility Level"=".NET 2.0 Subset" in the Player Settings.

I had this problem in an android build with Unity 5.1.3. It was due to stripping.
Preserving class System.Reflection.MonoProperty fixed the problem

Here is my link.xml file:

<linker>
    <assembly fullname="System">
        <namespace fullname="System.ComponentModel" preserve="all"/>
        <namespace fullname="System.Net" preserve="all"/>
        <namespace fullname="System.Net.Configuration" preserve="all"/>
        <namespace fullname="System.Threading" preserve="all"/>
        <namespace fullname="System.Net.Sockets" preserve="all"/>
        <namespace fullname="System.IO" preserve="all"/>
        <namespace fullname="System.Text" preserve="all"/>
        <namespace fullname="System.Collections" preserve="all"/>
        <namespace fullname="System.Collections.Generic" preserve="all"/>
        <type fullname="System.Net.WebRequest" preserve="all"/>
        <namespace fullname="System.Diagnostics" preserve="all"/>
        <namespace fullname="System.Diagnostics.DiagnosticsConfigurationHandler" preserve="all"/>
        <namespace fullname="System" preserve="all"/>
    </assembly>

    <assembly fullname="mscorlib">
        <namespace fullname="System.Security.Cryptography" preserve="all"/>
        <type fullname="System.Net.WebResponse" preserve="all" />
        <type fullname="System.Net.HttpWebResponse" preserve="all" />
        <type fullname="System.Reflection.MonoProperty" preserve="all" />
    </assembly>

    <assembly fullname="System.Configuration">
        <namespace fullname="System.Configuration.ExeConfigurationHost" preserve="all"/>
        <namespace fullname="System.Configuration" preserve="all"/>
    </assembly>

    <assembly fullname="Mono.Security">
        <namespace fullname="Mono.Security.Protocol.Tls" preserve="all"/>
        <namespace fullname="Mono.Security.X509" preserve="all"/>
    </assembly>
</linker>

@hscheidl Great! Thanks for the advise! I have faced with the problem before Unity 5.1, and your solution seems more correct