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We have a mobile app in production built using Maui. The server running the api is it connecting to uses .net framework. There are issues connecting to signalR from iOS17 devices. From debug we can see the following:
iOS 17 device sets the connectionData variable to encoded.
iOS 16 device sets it correctly.
It there a way to get iOS 17 device to send the connectionData the same as an iOS 16 device?
Please help! The mobile application is in production.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(22.400000000000002, 3%, 12%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EWZ%3C/text%3E%3C/svg%3E)
It looks like the iOS17 device are using percent-encoding (URL encoding), which replaces unsafe ASCII characters with a "%" followed by two hexadecimal digits. And you said you are using .NET framework, and I can see you add "ASP.NET" tag, do you send request in your Web? And you can check if you set UrlEncode for the url.
I tried to replace the encoded string and tested on iOS, but it only can pass by the first level of the Json string. I will get connectionData=[%7B%22Name%22:%22EventLogHub%22%7D] using the following code:
NSString nSString = new NSString("https://gardisdemo.tdsi.co.uk:53198/signalr/negotiate?clientProtocol=2.1&**connectionData=%5B%257B%2522Name%2522:%2522EventLogHub%2522%257D%5D**&access_token=eyJ0eXAiOi......");
var b= nSString.CreateStringByRemovingPercentEncoding();
var a = nSString.CreateStringByReplacingPercentEscapes(NSStringEncoding.UTF8);
If it's the default behavior that all urls will be encoded in iOS 17, you have to encode this Json string [{"Name":"EventLogHub"}] by UTF-8, then decode the string after getting the request.
The code is in Maui:
__hubConnection = new HubConnection($"{_apiUrl}", $"access_token={accessToken}");
__hub = hubConnection.CreateHubProxy("EventLogHub");
When the connection is started using
_hubConnection.Start()
we get an error 500 thrown by the server
It is the microsoft library creating the request string. Is there a way to intercept it before it is sent to the server?
No. It's suggested that you encode URL parameters as described in the ASP.NET Core doc. And get string in server side then decode the parameters.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(297.6, 98%, 38%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EPT%3C/text%3E%3C/svg%3E)
Any update on this issue ...I am facing it on calling _hubConnection.Start() specifically on iOS 17
We were unable to resolve and have had to remove that signalr functionality until we update the server code to .net core.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(150.4, 77%, 24%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ERR%3C/text%3E%3C/svg%3E)
I've encountered the same issue and figured out, that it works if you add following to your .csproj file:
<UseNativeHttpHandler>false</UseNativeHttpHandler>
With this option your app uses the managed implementation of HttpMessageHandler instead of the default platform implementation.
Hope this helps.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(163.2, 26%, 25%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ENM%3C/text%3E%3C/svg%3E)
This. This is the way.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(51.2, 85%, 14%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EFL%3C/text%3E%3C/svg%3E)
Any update on this issue? Thank you