request-value-lookup.md

Request Value Lookup

Get a value from one of multiple places in a request. Currently supports:

• Query
• Header

Attribute

Name	Type	Description
Location	RequestValueLocation	Location to check for value
Name	string	Priamary key name to look for
Aliases	string[]	Alternate key names

Example

public static class VersionedHttpTrigger
{
    [FunctionName(nameof(VersionedHttpTrigger))]
    public static async Task<IActionResult> RunAsync(
        [HttpTrigger(AuthorizationLevel.Function, "get", Route = "version")]
        HttpRequest req, ILogger log, [
            RequestValue(
            Location = RequestValueLocation.Header | RequestValueLocation.Query,
            Name = "apiVersion",
            Aliases = new[] { "x-api-version" }
        )]
        string version
    )
    {
        if (string.IsNullOrEmpty(version))
        {
            return new BadRequestResult();
        }

        log.LogInformation("Triggered for version {Version}", version);
        return new OkObjectResult(version);
    }
}