System.Net.Http.dll is missing during compilation

Hello! I'm trying to compile our game to webgl. For some reason it fails with error:

Code (CSharp):

1. [Exception] FileNotFoundException: Could not find file "/Users/michael/projects/client/Temp/StagingArea/Data/Managed/tempStrip/System.Net.Http.dll"
2. (wrapper remoting-invoke-with-check) System.IO.FileStream..ctor(string,System.IO.FileMode,System.IO.FileAccess,System.IO.FileShare)
3. System.IO.FileStream..ctor()    <ac823e2bb42b41bda67924a45a0173c3>:0
4. System.IO.FileStream..ctor()    <ac823e2bb42b41bda67924a45a0173c3>:0
5. ModuleDefinition.GetFileStream()    <28cdca1704d2491781795499c297b78b>:0
6. ModuleDefinition.ReadModule()    <28cdca1704d2491781795499c297b78b>:0
7. AssemblyDefinition.ReadAssembly()    <28cdca1704d2491781795499c297b78b>:0
8. AssemblyReferenceChecker.CollectReferencesFromRootsRecursive()    /Users/builduser/buildslave/unity/build/Editor/Mono/Utils/AssemblyReferenceChecker.cs:51
9. AssemblyReferenceChecker.CollectReferencesFromRootsRecursive()    /Users/builduser/buildslave/unity/build/Editor/Mono/Utils/AssemblyReferenceChecker.cs:64
10. AssemblyReferenceChecker.CollectReferencesFromRootsRecursive()    /Users/builduser/buildslave/unity/build/Editor/Mono/Utils/AssemblyReferenceChecker.cs:64
11. AssemblyReferenceChecker.CollectReferencesFromRoots()    /Users/builduser/buildslave/unity/build/Editor/Mono/Utils/AssemblyReferenceChecker.cs:74
12. CodeStrippingUtils.CollectManagedTypeReferencesFromRoots()    /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/CodeStrippingUtils.cs:428
13. CodeStrippingUtils.CollectNativeClassListFromRoots()    /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/CodeStrippingUtils.cs:411
14. CodeStrippingUtils.GenerateNativeClassList()    /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/CodeStrippingUtils.cs:363
15. CodeStrippingUtils.GenerateDependencies()    /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/CodeStrippingUtils.cs:109
16. AssemblyStripper.RunAssemblyStripper()    /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/AssemblyStripper.cs:347
17. AssemblyStripper.StripAssemblies()    /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/AssemblyStripper.cs:216
18. IL2CPPBuilder.Run()    /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:203
19. IL2CPPUtils.RunIl2Cpp()    /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:42
20. WebGlBuildPostprocessor.CompileBuild()    /Users/builduser/buildslave/unity/build/PlatformDependent/WebGL/Extensions/Unity.WebGL.extensions/BuildPostprocessor.cs:374
21. WebGlBuildPostprocessor.PostProcess()    /Users/builduser/buildslave/unity/build/PlatformDependent/WebGL/Extensions/Unity.WebGL.extensions/BuildPostprocessor.cs:952
22. DefaultBuildPostprocessor.PostProcess()    /Users/builduser/buildslave/unity/build/Editor/Mono/Modules/DefaultBuildPostprocessor.cs:27
23. PostprocessBuildPlayer.Postprocess()    /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/PostprocessBuildPlayer.cs:286
24. GUIUtility.ProcessEvent()
25.  

I've tried to remove Library and Temp folders but error perssists. I tried to add -r:System.Net.Http.dll to mcs.rsp. I have no clue were to go next. Any ideas?


Unity: 2018.3.4

Note: It works great in editor with webgl platform. Compiles and works great on standalone, ios and android.

 

Answering to my own questions. One of the libraries had WebGL specific version (main one was in Plugins, and override was in WebGL folder). This library happened to have been compiled with name that was not matched with it's filename - we had

WebGL/SmartFox.dll

but it actually should be

WebGL/SmartFox_WebGl.dll

(this is how it's provided, our mistake).

For some convoluted reason this creates error as above.

I'll try to create bug report.