How to decode URL in APIM policy

Question

I want to decode the query parameters in the URL. I am passing query parameter value as

 "somevalue%"

but when i am fetching the value of parameter it is showing like

"somevalue%25"

I want value as "somevalue%" only. Currently I am using Replace , but i want some decode method.

Thanks.

Answer 1

You can use System.Net.WebUtility.UrlDecode for this:

    <trace source="original">
        <message>@(context.Request.Url.Query.GetValueOrDefault("parm"))</message>
    </trace>
    <trace source="converted">
        <message>@(System.Net.WebUtility.UrlDecode(context.Request.Url.Query.GetValueOrDefault("parm")))</message>
    </trace>

In trace you would see a result like:

trace (0 ms)
{
    "message": "Expression was successfully evaluated.",
    "expression": "context.Request.Url.Query.GetValueOrDefault(\"parm\")",
    "value": "somevalue%25"
}
original (0 ms)
"somevalue%25"

trace (3 ms)
{
    "message": "Expression was successfully evaluated.",
    "expression": "System.Net.WebUtility.UrlDecode(context.Request.Url.Query.GetValueOrDefault(\"parm\"))",
    "value": "somevalue%"
}
converted (0 ms)
"somevalue%"