Question
I am getting a System.PlatformNotSupportedException from the mono platform when trying to run my blazor app on webassembly.
I autogenerated a web api client using Autorest. Everything is compiling fine but when I load the code in the browser I get the error below in the browser console.
Using a preview build of VS2017.
module.printErr @ MonoPlatform.ts:192
WASM: [System.PlatformNotSupportedException] Operation is not supported on this platform.
WASM: at System.Net.WebProxy.CreateDefaultProxy () <0x204ed08 + 0x00004> in <1c80af700ca2462a80a92d89ad803d6a>:0
WASM: at System.Net.Configuration.DefaultProxySectionInternal.GetSystemWebProxy () <0x204ebc0 + 0x00000> in <1c80af700ca2462a80a92d89ad803d6a>:0
WASM: at System.Net.Configuration.DefaultProxySectionInternal.GetDefaultProxy_UsingOldMonoCode () <0x204ea80 + 0x00000> in <1c80af700ca2462a80a92d89ad803d6a>:0
WASM: at System.Net.Configuration.DefaultProxySectionInternal.GetSection () <0x204e8c8 + 0x00022> in <1c80af700ca2462a80a92d89ad803d6a>:0
WASM: at System.Net.WebRequest.get_InternalDefaultWebProxy () <0x204e610 + 0x0002c> in <1c80af700ca2462a80a92d89ad803d6a>:0
WASM: at System.Net.HttpWebRequest..ctor (System.Uri uri) <0x2043eb0 + 0x000d2> in <1c80af700ca2462a80a92d89ad803d6a>:0
WASM: at System.Net.Http.HttpClientHandler.CreateWebRequest (System.Net.Http.HttpRequestMessage request) <0x20434d0 + 0x00016> in <3a9393eaef104ec489024eb855a8f163>:0
WASM: at System.Net.Http.HttpClientHandler+<SendAsync>d__64.MoveNext () <0x203ea60 + 0x00076> in <3a9393eaef104ec489024eb855a8f163>:0
WASM: --- End of stack trace from previous location where exception was thrown ---
...
Popular Answer
Yes it is possible. But you have to use the HttpClient that is injected by the blazor framework as described here:
https://learn-blazor.com/architecture/rest-api/
(thanks for the link Flores!)
The HttpClient is marked as protected in the Microsoft.Rest.ServiceClient that is used by Autorest. So to inject the HttpClient from blazor, you can create a new partial of the autogenerated client class and add a SetHttpClient method:
The class generated by autorest:
public partial class YourApi : ServiceClient<YourApi>, IYourApi
{
...
}
Your new partial:
public partial class YourApi
{
public void SetHttpClient(HttpClient client) {
this.HttpClient = client;
}
}
Nice and simple!