How to pass a url variable in web api that contains / or a question mark?

Question

I am developing an api in . net core and noticed that in the url if I want to pass for example https://localhost:44365/api/values/test=?/ or https://localhost:44365/api/values/test=//

An error occurs

[HttpGet("test={test}")]
public ActionResult<string> Get(string test)
{
  return  test;
}

[Update to the reply posted by @LINQ]

With %3Falready works It doesn’t work yet

Answer 1

? and / are characters reserved in a URL.

You will need to encoding these characters:

? stays %3F and / stays %2F.

Note that if your parameter should be in the query string, you are setting the route wrong.

You should use the attribute [FromRoute]. Thus:

[HttpGet("{test}")]
public IActionResult Get([FromRoute] string test)
{
    return Ok(test);
}