C#•3mo ago

✅ MAUI on Android - problem with HttpClient Post Method

Hello guys, i am creating this post after more than week of learning and trying to solve it by myself. I have problem with reaching my WebApi with Post Method. There is no problem with Get Method. The error i'm getting is: System.ObjectDisposedException: 'Cannot access a closed Stream.' Which makes literally 0 sense for me. (i dislike that C# took away from us destructors and that may be consequence of it ?) Here is code

     public static HttpClientHandler GetInsecureHandler()
     {
         HttpClientHandler handler = new HttpClientHandler();
         handler.ServerCertificateCustomValidationCallback = (message, cert, chain, errors) =>
         {
             if (cert.Issuer.Equals("CN=localhost"))
                 return true;
             return errors == System.Net.Security.SslPolicyErrors.None;
         };
         return handler;
     }


 
 private async Task<int> ConnectToApi_NotWorking()
 {
     HttpClientHandler insecureHandler = GetInsecureHandler();
     HttpClient client = new HttpClient(insecureHandler);
     client.Timeout = TimeSpan.FromSeconds(10);
     HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, $"http://192.168.0.175:5297/api/Login");

     request.Headers.Add("accept", "application/json");

     request.Content = new StringContent("{\n\"login\":\"a\",\n\"password\":\"a\"\n}");
     request.Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");

     HttpResponseMessage response = await client.SendAsync(request);
     response.EnsureSuccessStatusCode();
     string responseBody = await response.Content.ReadAsStringAsync();
     await DisplayAlert("AA", responseBody.ToString(), "ok");
     return 0;
 }

     public static HttpClientHandler GetInsecureHandler()
     {
         HttpClientHandler handler = new HttpClientHandler();
         handler.ServerCertificateCustomValidationCallback = (message, cert, chain, errors) =>
         {
             if (cert.Issuer.Equals("CN=localhost"))
                 return true;
             return errors == System.Net.Security.SslPolicyErrors.None;
         };
         return handler;
     }


 
 private async Task<int> ConnectToApi_NotWorking()
 {
     HttpClientHandler insecureHandler = GetInsecureHandler();
     HttpClient client = new HttpClient(insecureHandler);
     client.Timeout = TimeSpan.FromSeconds(10);
     HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, $"http://192.168.0.175:5297/api/Login");

     request.Headers.Add("accept", "application/json");

     request.Content = new StringContent("{\n\"login\":\"a\",\n\"password\":\"a\"\n}");
     request.Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");

     HttpResponseMessage response = await client.SendAsync(request);
     response.EnsureSuccessStatusCode();
     string responseBody = await response.Content.ReadAsStringAsync();
     await DisplayAlert("AA", responseBody.ToString(), "ok");
     return 0;
 }

I will add full git project if needed. There is no problem with implementation of Login in API (tested with same code run on Windows and using Postman)

183 Replies

Badboy•3mo ago

Here comes the repo https://github.com/Badboy-2/MAUI_HttpClient

GitHub

GitHub - Badboy-2/MAUI_HttpClient: Showcase of problem i encountere...

Showcase of problem i encountered using HttpClient in MAUI - Badboy-2/MAUI_HttpClient

Stefanidze•3mo ago

Where in the code you are getting the exception? There is a lot of things that can be disposed here...

Badboy•3mo ago

@Stefanidze In MainPage.xaml.cs line 66 or just

HttpResponseMessage response = await client.SendAsync(request);

HttpResponseMessage response = await client.SendAsync(request);

it skips to 'return 0;' then throws System.ObjectDisposedException: 'Cannot access a closed Stream.' Everything is in same context... i don't really understand what is happening

Badboy•3mo ago

Image just to portray, and also values from debugger

Badboy•3mo ago

they are disposed too early but how come, they are

Unknown User•3mo ago

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Badboy•3mo ago

I know, but i was trying to set up perfectly clear code. I created a project, so everyone could fork, and try to run this on andro emulator or take function as whole

Unknown User•3mo ago

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Badboy•3mo ago

it's not main code and no, it won't

Stefanidze•3mo ago

Have you tried?

Badboy•3mo ago

already tried to make it only thing in program

Unknown User•3mo ago

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Badboy•3mo ago

i tried that man it doesn't work, my english is bad or what

Unknown User•3mo ago

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Badboy•3mo ago

Because i tired to show that it doesn;t work in any method

Unknown User•3mo ago

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Badboy•3mo ago

Okay

Unknown User•3mo ago

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Badboy•3mo ago

that's only one of approaches i know it's utterly terrible

Unknown User•3mo ago

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Badboy•3mo ago

kk, give me like 20 minutes and i will clean it up

Unknown User•3mo ago

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Badboy•3mo ago

Maui is bug as whole

Unknown User•3mo ago

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Badboy•3mo ago

Yeah, but it only doesn't work on post method

Unknown User•3mo ago

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Badboy•3mo ago

you could put get into that bullshit and it works

Unknown User•3mo ago

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Badboy•3mo ago

put GET method*

Unknown User•3mo ago

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Badboy•3mo ago

@TeBeCo did it Again the link is: https://github.com/Badboy-2/MAUI_HttpClient/tree/master/MAUI_HttpClient

GitHub

MAUI_HttpClient/MAUI_HttpClient at master · Badboy-2/MAUI_HttpClient

Showcase of problem i encountered using HttpClient in MAUI - Badboy-2/MAUI_HttpClient

Badboy•3mo ago

The middle one with suffix _working still works, others do not It doesn't even try to execute reading from response, object are just dying

Asthreya.•3mo ago

Did you enabled cors on the api? I don't see this problem related to maui tho

Badboy•3mo ago

Sorry... did i enable what ? Do you want me put WebAPi project to git ?

Asthreya.•3mo ago

Wait...

Unknown User•3mo ago

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Badboy•3mo ago

Also i think it would be sus, if it would be problem on API site, bc it works on windows emulator and swagger postman also Literally below you have version you desire which also doesnt work

Unknown User•3mo ago

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Badboy•3mo ago

YES

Asthreya.•3mo ago

app.UseCors(x => x
    .AllowAnyMethod()
    .AllowAnyHeader()
    .SetIsOriginAllowed(origin => true)
    .AllowCredentials());

app.UseCors(x => x
    .AllowAnyMethod()
    .AllowAnyHeader()
    .SetIsOriginAllowed(origin => true)
    .AllowCredentials());

I usually add this on my webapi builder but I bet this method is risky. Ask @TeBeCo

Badboy•3mo ago

for showcase It's not duplicated bc it works diffrent way i don't have anything working, so it's good to try like ... 2 options at once ? not only one ?

Asthreya.•3mo ago

Because it accepts any method anywhere

Badboy•3mo ago

Is this wrong approach ? Will try that, give me sec

Asthreya.•3mo ago

Its good for learning how webapi works. which i still do @TeBeCo helps a lot of devs here and I'm sure he already forgets that he helped me before Thanks again tho

Badboy•3mo ago

Is it duplication if it works diffrently but result is same ? I mean i know in PROD it is, but this isn't PROD. Should i just go with one instead of 2 ? I thought showcasing is somehow good ?

Unknown User•3mo ago

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Badboy•3mo ago

No problem 🙂 Take your time, goodluck also System.ObjectDisposedException: 'Cannot access a closed Stream.' Stills pops up, but i noticed NetworkSecurityConfig] No Network Security Config specified, using platform default

Badboy•3mo ago

Asthreya.•3mo ago

Does it work on a non-maui project?

Unknown User•3mo ago

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Asthreya.•3mo ago

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <application android:allowBackup="true" android:icon="@mipmap/appicon" android:roundIcon="@mipmap/appicon_round" android:supportsRtl="true" android:usesCleartextTraffic="true"></application>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.INTERNET" />
</manifest>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <application android:allowBackup="true" android:icon="@mipmap/appicon" android:roundIcon="@mipmap/appicon_round" android:supportsRtl="true" android:usesCleartextTraffic="true"></application>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.INTERNET" />
</manifest>

I added

android:usesCleartextTraffic="true"

android:usesCleartextTraffic="true"

Asthreya.•3mo ago

Here

Asthreya.•3mo ago

https://stackoverflow.com/questions/39933345/no-network-security-config-specified-using-platform-default-android-log

Stack Overflow

No Network Security Config specified, using platform default - Andr...

I am trying to make a database via 000webhost.com. I keep getting this message showing in the event log whenever I run the app from android studio. Does anyone knows how to solve this problem? Much

Asthreya.•3mo ago

Open it with xml text editor Does this also shows when you didn't add cors?

Badboy•3mo ago

Yes

Asthreya.•3mo ago

This one?

Asthreya.•3mo ago

Try this out

Unknown User•3mo ago

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leowest•3mo ago

MAUI only does webview if you're doing say blazor over maui

Asthreya.•3mo ago

But its still native

leowest•3mo ago

or when u you to auth against oauth

Asthreya.•3mo ago

Just the view isn't

leowest•3mo ago

we are talking about the need of CORS

Asthreya.•3mo ago

Oh so I guess it doesn't need cors Brb dinner

Unknown User•3mo ago

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Badboy•3mo ago

No :/ you will have to put your ip in API config files is it acceptable ?

Unknown User•3mo ago

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Badboy•3mo ago

Okay, i'm on it

Unknown User•3mo ago

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Badboy•3mo ago

Thank you guys for your time, i really do appreciate it

Asthreya.•3mo ago

Have you tried this?

Badboy•3mo ago

Yea, mine AndroidManifest.xml looks like this

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <application android:allowBackup="true" android:icon="@mipmap/appicon" android:supportsRtl="true" android:label="MAUI_TEST"></application>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-sdk android:minSdkVersion="25" android:targetSdkVersion="25" />
</manifest>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <application android:allowBackup="true" android:icon="@mipmap/appicon" android:supportsRtl="true" android:label="MAUI_TEST"></application>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-sdk android:minSdkVersion="25" android:targetSdkVersion="25" />
</manifest>

Asthreya.•3mo ago

Badboy•3mo ago

wait what

Asthreya.•3mo ago

I added

android:usesCleartextTraffic="true"

android:usesCleartextTraffic="true"

The one i cloned looked different on yours but try to add this

Badboy•3mo ago

It is there

Asthreya.•3mo ago

Where?

Badboy•3mo ago

I accidentally pasted code from my opened copy of this project

Badboy•3mo ago

https://github.com/Badboy-2/MAUI_HttpClient/blob/master/MAUI_HttpClient/Platforms/Android/AndroidManifest.xml

GitHub

MAUI_HttpClient/MAUI_HttpClient/Platforms/Android/AndroidManifest.x...

Showcase of problem i encountered using HttpClient in MAUI - Badboy-2/MAUI_HttpClient

Asthreya.•3mo ago

Oh it's in the "branch" branch

Badboy•3mo ago

yea, im stupid

Asthreya.•3mo ago

Did it worked?

Badboy•3mo ago

No 😦 But i believe it was necessary step whe had to took. We have to kinda rip all security apart, to see whats going on imho

leowest•3mo ago

@Badboy you also need to add

<EmbedAssembliesIntoApk>true</EmbedAssembliesIntoApk>

<EmbedAssembliesIntoApk>true</EmbedAssembliesIntoApk>

To your csproj because u have a lot of missing libraries being loaded

leowest•3mo ago

Badboy•3mo ago

https://github.com/Badboy-2/MAUI_HttpClient https://github.com/Badboy-2/WebAPI_ForMaui Replace this string in both project 192.168.0.175 with your ip (Ctrl+H ready, 0 risk involved :p) Additionaly i think you have to add exceptions to firewall for port 5297 and 7258 / turn off firewall

GitHub

GitHub - Badboy-2/MAUI_HttpClient: Showcase of problem i encountere...

Showcase of problem i encountered using HttpClient in MAUI - Badboy-2/MAUI_HttpClient

GitHub

GitHub - Badboy-2/WebAPI_ForMaui

Contribute to Badboy-2/WebAPI_ForMaui development by creating an account on GitHub.

Badboy•3mo ago

Thanks! Will add it in moment This powershell comamand will create exceptions in your firewall

$ports = @(5297, 7258)
foreach ($port in $ports) {
    New-NetFirewallRule -DisplayName "Custom Inbound Rule for Port $port" `
                        -Description "Allows inbound traffic on port $port" `
                        -Direction Inbound `
                        -LocalPort $port `
                        -Protocol TCP `
                        -Action Allow
    New-NetFirewallRule -DisplayName "Custom Outbound Rule for Port $port" `
                        -Description "Allows outbound traffic on port $port" `
                        -Direction Outbound `
                        -LocalPort $port `
                        -Protocol TCP `
                        -Action Allow
}

$ports = @(5297, 7258)
foreach ($port in $ports) {
    New-NetFirewallRule -DisplayName "Custom Inbound Rule for Port $port" `
                        -Description "Allows inbound traffic on port $port" `
                        -Direction Inbound `
                        -LocalPort $port `
                        -Protocol TCP `
                        -Action Allow
    New-NetFirewallRule -DisplayName "Custom Outbound Rule for Port $port" `
                        -Description "Allows outbound traffic on port $port" `
                        -Direction Outbound `
                        -LocalPort $port `
                        -Protocol TCP `
                        -Action Allow
}

UDP too ? :andyHmm:

leowest•3mo ago

@Badboy your problem have nothing to do with usesCleartextTraffic because that is used when you're making a non-https connection but you're trying to access https. On top of that you want to access a localhost certified ssl, so if you wrap the httpclient with a try and catch u will most likely get a Trust anchor for certification path not found. error that backs that up what you would have to do is create a custom android message handler with your internal api ip i.e.:

#if ANDROID
    internal sealed class CustomAndroidMessageHandler : Xamarin.Android.Net.AndroidMessageHandler
    {
        protected override Javax.Net.Ssl.IHostnameVerifier GetSSLHostnameVerifier(Javax.Net.Ssl.HttpsURLConnection connection)
            => new CustomHostnameVerifier();

        private sealed class CustomHostnameVerifier : Java.Lang.Object, Javax.Net.Ssl.IHostnameVerifier
        {
            public bool Verify(string? hostname, Javax.Net.Ssl.ISSLSession? session)
            {
                return
                    Javax.Net.Ssl.HttpsURLConnection.DefaultHostnameVerifier.Verify(hostname, session)
                    || hostname == "10.0.0.1" && session.PeerPrincipal?.Name == "CN=localhost";
            }
        }
    }
#endif

#if ANDROID
    internal sealed class CustomAndroidMessageHandler : Xamarin.Android.Net.AndroidMessageHandler
    {
        protected override Javax.Net.Ssl.IHostnameVerifier GetSSLHostnameVerifier(Javax.Net.Ssl.HttpsURLConnection connection)
            => new CustomHostnameVerifier();

        private sealed class CustomHostnameVerifier : Java.Lang.Object, Javax.Net.Ssl.IHostnameVerifier
        {
            public bool Verify(string? hostname, Javax.Net.Ssl.ISSLSession? session)
            {
                return
                    Javax.Net.Ssl.HttpsURLConnection.DefaultHostnameVerifier.Verify(hostname, session)
                    || hostname == "10.0.0.1" && session.PeerPrincipal?.Name == "CN=localhost";
            }
        }
    }
#endif

then you would need to add that handler to your httpclient i.e.:

#if ANDROID
            HttpMessageHandler? handler = new CustomAndroidMessageHandler
            {
                ServerCertificateCustomValidationCallback = (message, cert, chain, errors) =>
                {
                    if (cert != null && cert.Issuer.Equals("CN=localhost"))
                        return true;
                    return (int)errors == 0;
                }
            };
            _httpClient = new HttpClient(handler);
#else
            _httpClient = new HttpClient();
#endif

#if ANDROID
            HttpMessageHandler? handler = new CustomAndroidMessageHandler
            {
                ServerCertificateCustomValidationCallback = (message, cert, chain, errors) =>
                {
                    if (cert != null && cert.Issuer.Equals("CN=localhost"))
                        return true;
                    return (int)errors == 0;
                }
            };
            _httpClient = new HttpClient(handler);
#else
            _httpClient = new HttpClient();
#endif

so in my case my api internal ip is 10.0.0.1 in your case you have to update it to yours

Unknown User•3mo ago

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leowest•3mo ago

@TeBeCo I mean u wouldn't need any of this if u had the api was else where

Unknown User•3mo ago

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leowest•3mo ago

u also dont need any of this for local

Unknown User•3mo ago

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leowest•3mo ago

u can't target iOS afaik u need a device but I haven't start doing iOS so dont take my word for it

Unknown User•3mo ago

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leowest•3mo ago

just change your targat to android I can't read a thing in your video sorry its too small

Unknown User•3mo ago

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leowest•3mo ago

that would be WSL Android not google emulator AFAIK

Unknown User•3mo ago

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leowest•3mo ago

mmm weird mine doesnt say WSA maybe because ur on w11?

Unknown User•3mo ago

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leowest•3mo ago

I dont have that

Unknown User•3mo ago

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leowest•3mo ago

so I guess vs uses a completely different thing for android on w11

Unknown User•3mo ago

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leowest•3mo ago

emulator is pretty fast for me never had issues

Unknown User•3mo ago

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leowest•3mo ago

yeah I dont disagree I never had the change to try wsa so I dont know how different it is unhappily

Unknown User•3mo ago

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leowest•3mo ago

I honestly dont know how it runs with WSA

Unknown User•3mo ago

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leowest•3mo ago

with emulator it starts everything for u

Unknown User•3mo ago

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leowest•3mo ago

that would have been a bliss if the emualtor had that ah ok it recognizes it by default too nice

Unknown User•3mo ago

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leowest•3mo ago

too bad they taking it down I wonder how fast it is too

Unknown User•3mo ago

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leowest•3mo ago

that looks about the same as the emulator thou

Unknown User•3mo ago

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leowest•3mo ago

no I mean the ui

Unknown User•3mo ago

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leowest•3mo ago

no, I mean the screenshot above is the same app u use on either wsa or the emulator to create the device its not different

Unknown User•3mo ago

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leowest•3mo ago

mm I just use 4096 there instead

Unknown User•3mo ago

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leowest•3mo ago

let me chck

Unknown User•3mo ago

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leowest•3mo ago

ah no on that one it was default to

leowest•3mo ago

Unknown User•3mo ago

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leowest•3mo ago

Unknown User•3mo ago

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leowest•3mo ago

it does allow for both

Unknown User•3mo ago

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leowest•3mo ago

I dont have a mic for it but yeah your right it doesn'tr accept G never paid attention to it I never had to mess with that beyond creating the device

Unknown User•3mo ago

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leowest•3mo ago

Deploy: 0 succeeded, 0 failed, 1 skipped?

Unknown User•3mo ago

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leowest•3mo ago

I dont know let me clone his repo to try

Unknown User•3mo ago

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leowest•3mo ago

but u originally loaded the last project he sent in right

Unknown User•3mo ago

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leowest•3mo ago

sure but it builds without doing anythng thou

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leowest•3mo ago

>Done building project "MAUI_HttpClient.csproj".
========== Rebuild All: 1 succeeded, 0 failed, 0 skipped ==========
========== Rebuild completed at 12:26 and took 59,498 seconds ==========

>Done building project "MAUI_HttpClient.csproj".
========== Rebuild All: 1 succeeded, 0 failed, 0 skipped ==========
========== Rebuild completed at 12:26 and took 59,498 seconds ==========

Unknown User•3mo ago

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leowest•3mo ago

well it all works here to deploy too

Unknown User•3mo ago

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leowest•3mo ago

im latest preview everything it all run without touching anything

Unknown User•3mo ago

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leowest•3mo ago

sure, and all I am saying is that I didn't have to do anything to run it, so I dont know why u had to vs that

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leowest•3mo ago

I dont have net7 either

Unknown User•3mo ago

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leowest•3mo ago

Unknown User•3mo ago

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leowest•3mo ago

that's why I dont understand why ur having such issues

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leowest•3mo ago

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leowest•3mo ago

since the answer was burry, @Badboy just for clarity I provided the solution from there so u can read it: https://discord.com/channels/143867839282020352/1221703280204451932/1221830944231657603

MODiX•3mo ago

leowest

<@1221689581276106802> your problem have nothing to do with usesCleartextTraffic because that is used when you're making a non-https connection but you're trying to access https. On top of that you want to access a localhost certified ssl, so if you wrap the httpclient with a try and catch u will most likely get a Trust anchor for certification path not found. error that backs that up

Quoted by

<@1102729783969861782> from #MAUI on Android - problem with HttpClient Post Method (click here)

React with ❌ to remove this embed.

Badboy•3mo ago

How come you think so ? In LAN firewall rules do apply still. Am i missing something ? Or did you mean local - like in local device (not Local network)

leowest•3mo ago

yeah my bad if your api is on a different pc then yes you might need it, for local u dont but either way u can place the sealed class in its own file in the android platform folder and then use from the main code and it should work

Badboy•3mo ago

Oh got it, thank you guys soo much for your intel. I appreciate, tomorrow morning( in like 10 hours) i will sit to this after some sleep. Even if it won't work, i still learnt a huge deal of things 🙂 For that i am grateful

leowest•3mo ago

I mean I tried it myself so I hope it works 😉 I did not try it from a machine within my local network but assuming u can access it via the browser u should be able to reach it just fine from the app the problem is that it expects the url to be localhost because its the certificate but its not so you need to further add the hostname verification to your local ip I also strongly recommend u to wrap those under #if DEBUG as well u dont want that to acciddentally land on the final product

Badboy•3mo ago

@leowest Thank you very much 🙂 it DOES WORK and for SSL also ;_; i tried to use nonSSL connections bc of marathon-long threads i saw about this problem on forums (it said SSL version mismatch makes it impossible to connect, thus using nonSSL) I kinda don't believe still, after all this time. You guys really make it. To everyone involved

Badboy•3mo ago

https://tenor.com/view/kudos-oprah-you-and-you-pointing-gif-14437178

Tenor

Badboy•3mo ago

@TeBeCo Also i will try your code tonight on diffrent platform (i truly do not want to mess up what is working) (and i'm afraid of installing newer versions of .NET, 99% i'm just dumb not doing it right away, but caution is too strong in me) (so i will do it firstly not on my DevEnv)

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Badboy•3mo ago

Yeah sure, good idea 😄

Unknown User•3mo ago

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Badboy•3mo ago

names of files ?

Unknown User•3mo ago

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Badboy•3mo ago

or objects etc. okay

Unknown User•3mo ago

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Badboy•3mo ago

I come from C++, and was pretty sure, that underscore is safe Good to know it isn't Do you perhaps have any clue why could underscore mess things up ? The idea of underscore was to not mess things up, i believe Like parser thing, or smtn ?

leowest•3mo ago

no worries, yeah it was not simple because the output window was not giving any useful information once I wrapped the error in a try catch it gave me a complete different error message which was what lead me to the answer the only thing the output spotted was that u needed to embed the libraries into the apk nevertheless glad it worked for u 🙂 $close

MODiX•3mo ago

Use the /close command to mark a forum thread as answered

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✅ MAUI on Android - problem with HttpClient Post Method