Azure Functions not accepting an url-encoded value as a query parameter?

Question

I am trying to use a domain as a query param in an Azure Function app.

Something like this:

/api/foo/bar/{url}

/api/foo/bar/https%3a%2f%2flocalhost%3a3000

This doesn't hit the function (although it works locally, although is automatically decodes the : which is annoying), is this as expected? (it does work if I had it as a query string)

Can you please provide more details on your requirement? Also please share your function code — Ikhtesam Afrin
– Ikhtesam Afrin, Commented Jun 21, 2024 at 4:41
i am not sure what else you need, a c# function has a route set to the route above, and when i send the route with a value it says resource not found and doesn't hit the function, eg no function is processed. — EnenDaveyBoy
– EnenDaveyBoy, Commented Jun 21, 2024 at 11:31
I am getting this output and my function is triggered too. Are you looking for this solution? — Ikhtesam Afrin
– Ikhtesam Afrin, Commented Jun 21, 2024 at 11:59
if you read the op, it says it works locally although it decodes the :, so the value isn't consistants but doesn't work in azure as a live function — EnenDaveyBoy
– EnenDaveyBoy, Commented Jun 21, 2024 at 12:02

ΩmegaMan · Accepted Answer · 2024-06-21 13:25:16Z

2

You need to use the double encoded URL in the request while running in function app. Pass https%253a%252f%252flocalhost%253a3000 instead of https%3a%2f%2flocalhost%3a3000 while invoking the function in function app.

I have below function code which is deployed to function app.

[FunctionName("Function1")]
public static async Task<IActionResult> 
    Run([HttpTrigger(AuthorizationLevel.Anonymous, 
                     "get", "post", 
                      Route = "foo/bar/{encodedUrl}")] 
                           HttpRequest req,
        string encodedUrl, ILogger log)
{
    log.LogInformation("C# HTTP trigger function processed a request.");

    string decodedUrl = HttpUtility.UrlDecode(encodedUrl);

    string name = req.Query["name"];

    string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
    dynamic data = JsonConvert.DeserializeObject(requestBody);
    name = name ?? data?.name;

    string responseMessage = string.IsNullOrEmpty(name)
        ? $"This HTTP triggered function executed successfully. The decoded URL is: {decodedUrl}. Pass a name in the query string or in the request body for a personalized response."
        : $"Hello, {name}. This HTTP triggered function executed successfully. The decoded URL is: {decodedUrl}.";

    return new OkObjectResult(responseMessage);
}

I am passing the value of encodedUrl as https%253a%252f%252flocalhost%253a3000 and it worked as expected.

enter image description here

edited Jun 21, 2024 at 13:25

ΩmegaMan

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answered Jun 21, 2024 at 12:36

Ikhtesam Afrin

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6 Comments

EnenDaveyBoy Over a year ago

thanks, is there a reason this is happens like this?

Ikhtesam Afrin Over a year ago

I believe single encoded URL is getting decoded and the initial url breaks hence throwing 404.

EnenDaveyBoy Over a year ago

would you consider that a bug which requires reporting?

Ikhtesam Afrin Over a year ago

Yes. More importantly we can't get the error logs for this issue as its a not found case

EnenDaveyBoy Over a year ago

thanks for the help, i am gunna use querystring for stability, ill report the issue and if it gets sorted i might revert back

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