Java.Net.MalformedURLException: unknown protocol

[IvanDmitriev1]

Android application type

Android for .NET (net6.0-android, etc.)

Affected platform version

VS 2022 17.4.0 Preview 1.0, dotnet 6.0.400

Description

After switching to dotnet maui from xamarin.forms exception occurred Java.Net.MalformedURLException: 'unknown protocol: steammobile. I do not know where the steammobile protocol is, but in xamarin.forms and wpf dotnet 6 are fine.

As far as I understand, HttpClient on android uses HttpURLConnection, and there doesn't seem to be a Java.Net.MalformedURLException with it.

Steps to Reproduce

var url1 = "https://steamcommunity.com";
var url2 = "/mobileconf/conf?";

var client = new HttpClient();
client.BaseAddress = new Uri(url1);

try
{
	using var responseMessage = await client.GetAsync(url1 + url2);
}
catch (Java.Net.MalformedURLException e)
{
            
}

Did you find any workaround?

var url1 = "https://steamcommunity.com";
var url2 = "/mobileconf/conf?";

await Task.Run(() =>
{
	Java.Net.URL javaUrl = new Java.Net.URL(url1 + url2);
	var connection = (HttpURLConnection) javaUrl.OpenConnection()!;

	connection.SetRequestProperty("GET", null);
	var code = connection.ResponseCode;
});

Relevant log output

No response

[grendello]

@simonrozsival mind taking a look? Thanks!

[simonrozsival]

@IvanDmitriev1 the GET https://steamcommunity.com/mobileconf/conf? request results in a 302 pointing to steammobile://lostauth:

$ curl -v "https://steamcommunity.com/mobileconf/conf?"
*   Trying 23.194.10.138:443...
* Connected to steamcommunity.com (23.194.10.138) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
*  CAfile: /etc/ssl/cert.pem
*  CApath: none
* (304) (OUT), TLS handshake, Client hello (1):
* (304) (IN), TLS handshake, Server hello (2):
* (304) (IN), TLS handshake, Unknown (8):
* (304) (IN), TLS handshake, Certificate (11):
* (304) (IN), TLS handshake, CERT verify (15):
* (304) (IN), TLS handshake, Finished (20):
* (304) (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / AEAD-CHACHA20-POLY1305-SHA256
* ALPN, server accepted to use http/1.1
* Server certificate:
*  subject: businessCategory=Private Organization; jurisdictionCountryName=US; jurisdictionStateOrProvinceName=Washington; serialNumber=602 290 773; C=US; ST=Washington; L=Bellevue; O=Valve Corp; CN=store.steampowered.com
*  start date: Jan 22 00:00:00 2022 GMT
*  expire date: Jan 24 23:59:59 2023 GMT
*  subjectAltName: host "steamcommunity.com" matched cert's "steamcommunity.com"
*  issuer: C=US; O=DigiCert Inc; OU=www.digicert.com; CN=DigiCert SHA2 Extended Validation Server CA
*  SSL certificate verify ok.
> GET /mobileconf/conf? HTTP/1.1
> Host: steamcommunity.com
> User-Agent: curl/7.79.1
> Accept: */*
> 
* Mark bundle as not supporting multiuse
< HTTP/1.1 302 Moved Temporarily
< Server: nginx
< Content-Type: text/html; charset=UTF-8
< X-Frame-Options: DENY
< Content-Security-Policy: default-src blob: data: https: 'unsafe-inline' 'unsafe-eval'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://community.akamai.steamstatic.com/ https://cdn.akamai.steamstatic.com/steamcommunity/public/assets/ https://api.steampowered.com/ *.google-analytics.com https://www.google.com https://www.gstatic.com https://apis.google.com https://recaptcha.net https://www.gstatic.cn/recaptcha/ https://www.youtube.com/ https://s.ytimg.com; object-src 'none'; connect-src 'self' https://community.akamai.steamstatic.com/ https://store.steampowered.com/ wss://community.steam-api.com/websocket/ https://api.steampowered.com/ https://login.steampowered.com/ https://help.steampowered.com/ *.google-analytics.com https://*.valvesoftware.com https://*.steambeta.net https://*.steamcontent.com https://steambroadcast.akamaized.net https://broadcast.st.dl.eccdnx.com https://lv.queniujq.cn https://steambroadcastchat.akamaized.net http://127.0.0.1:27060 ws://127.0.0.1:27060; frame-src 'self' steam: https://store.steampowered.com/ https://help.steampowered.com/ https://login.steampowered.com/ https://www.youtube.com https://www.google.com https://sketchfab.com https://player.vimeo.com https://medal.tv https://www.google.com/recaptcha/ https://recaptcha.net/recaptcha/; frame-ancestors 'self' https://steamloopback.host ;
< Expires: Mon, 26 Jul 1997 05:00:00 GMT
< Cache-Control: no-cache
< Location: steammobile://lostauth
< Content-Encoding: gzip
< Vary: Accept-Encoding
< Content-Length: 20
< Date: Wed, 07 Sep 2022 15:10:25 GMT
< Connection: keep-alive
< Set-Cookie: sessionid=***; Path=/; Secure; SameSite=None
< Set-Cookie: steamCountry=***; Path=/; Secure; HttpOnly; SameSite=None
< 
* Failure writing output to destination
* Closing connection 0
*

I think you need to use a different URL to make the request.

@grendello @jonpryor I think that we shouldn't let the raw Java exception escape AndroidMessageHandler and we should wrap it in HttpRequestException (as per discussion in #7246), shouldn't we?

@grendello I think we can close this PR now, there's nothing actionable on our side IMO.

[IvanDmitriev1]

@simonrozsival And yes, redirection happens, but there were no exceptions in dotnet 6, xamarin.forms instead in the response messages 302 Moved Temporarily status code has returned. As with HttpURLConnection the 302 response code will be returned.

[simonrozsival]

@IvanDmitriev1 I see. You need to disable automatic redirects then:

var handler = new HttpClientHandler { AllowAutoRedirect = false };
var client = new HttpClient(handler);
var responseMessage = await client.GetAsync(url1 + url2);

[IvanDmitriev1]

@IvanDmitriev1 I see. You need to disable automatic redirects then:

var handler = new HttpClientHandler { AllowAutoRedirect = false };
var client = new HttpClient(handler);
var responseMessage = await client.GetAsync(url1 + url2);

Thanks !