Web API .net core 2 request check the request's header is not empty

Question

How can I verify whether the request's header some-header matches book's bookId?

    public IActionResult GetBooks()
    {
        // if 'some-header' value is empty, null , whitespace or request contains multiple ' some-header' headers then it should return UnauthorizedResult();
       // if 'some-header' is not above then it needs to be read from repository
    }
    public class Book 
    {
     public string bookId {get; set;}
    }

Tiago Silva · Accepted Answer · 2019-10-23 07:43:52Z

2

Request.Headers.GetValues() will return an IEnumerable<string> that correspond the headers from the HTTP request , then you can validate wether this contains multiple values or if its only one check if is null or white space ( which includes empty )

Request.Headers.TryGetValue("some-header", out var headers);         
if(headers.Count > 1 || string.IsNullOrWhiteSpace(headers.FirstOrDefault())){
   return new UnauthorizedResult();
}

edited Oct 23, 2019 at 7:43

answered Oct 22, 2019 at 10:58

Tiago Silva

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5 Comments

Lauren Over a year ago

'IHeaderDictionary' does not contain a definition for 'GetValues' and no accessible extension method 'GetValues' accepting a first argument of type 'IHeaderDictionary' could be found (are you missing a using directive or an assembly reference?) I am using .net core 2. do I have to add any specific reference?

Tiago Silva Over a year ago

@Lauren Apparently that did method did not exist I changed my code with the correct method

Lauren Over a year ago

cannot convert from 'out System.Collections.Generic.IEnumerable<string>' to 'out Microsoft.Extensions.Primitives.StringValues'

Tiago Silva Over a year ago

@Lauren Check my new edit , sorry for wasting a bit your time I should test things before post it in SO!

Edward Over a year ago

Should it be return new UnauthorizedResult();?

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