- aligns on the abstractions header type

Signed-off-by: Vincent Biret <vibiret@microsoft.com>

Author: baywet

Microsoft.Kiota.Http.HttpClientLibrary.Tests/Middleware/HeadersInspectionHandlerTests.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Net.Http;
 using System.Threading.Tasks;
 using Microsoft.Kiota.Http.HttpClientLibrary.Middleware;
@@ -33,7 +34,7 @@ public async Task HeadersInspectionHandlerGetsRequestHeaders()
         var response = await invoker.SendAsync(request, default);
 
         // Then
-        Assert.Equal("test", option.RequestHeaders["test"]);
+        Assert.Equal("test", option.RequestHeaders["test"].First());
         Assert.Empty(option.ResponseHeaders);
     }
     [Fact]
@@ -50,7 +51,7 @@ public async Task HeadersInspectionHandlerGetsResponseHeaders()
         var response = await invoker.SendAsync(request, default);
 
         // Then
-        Assert.Equal("test", option.ResponseHeaders["test"]);
+        Assert.Equal("test", option.ResponseHeaders["test"].First());
         Assert.Empty(option.RequestHeaders);
     }
     private HttpMessageInvoker GetMessageInvoker(HeadersInspectionHandlerOption option = null)

src/Middleware/HeadersInspectionHandler.cs

@@ -4,6 +4,7 @@
 
 using System;
 using System.Diagnostics;
+using System.Linq;
 using System.Net.Http;
 using System.Threading;
 using System.Threading.Tasks;
@@ -52,15 +53,15 @@ protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage
             {
                 foreach(var header in request.Headers)
                 {
-                    options.RequestHeaders[header.Key] = string.Join(",", header.Value);
+                    options.RequestHeaders[header.Key] = header.Value.ToArray();
                 }
             }
             var response = await base.SendAsync(request, cancellationToken);
             if(options.InspectResponseHeaders)
             {
                 foreach(var header in response.Headers)
                 {
-                    options.ResponseHeaders[header.Key] = string.Join(",", header.Value);
+                    options.ResponseHeaders[header.Key] = header.Value.ToArray();
                 }
             }
             return response;

src/Middleware/Options/HeadersInspectionHandlerOption.cs

@@ -2,30 +2,34 @@
 //  Copyright (c) Microsoft Corporation.  All Rights Reserved.  Licensed under the MIT License.  See License in the project root for license information.
 // ------------------------------------------------------------------------------
 
-using System;
-using System.Collections.Generic;
 using Microsoft.Kiota.Abstractions;
 
 namespace Microsoft.Kiota.Http.HttpClientLibrary.Middleware.Options;
 /// <summary>
 /// The Headers Inspection Option allows the developer to inspect the headers of the request and response.
 /// </summary>
-public class HeadersInspectionHandlerOption: IRequestOption
+public class HeadersInspectionHandlerOption : IRequestOption
 {
     /// <summary>
     /// Gets or sets a value indicating whether the request headers should be inspected.
     /// </summary>
-    public bool InspectRequestHeaders { get; set; }
+    public bool InspectRequestHeaders
+    {
+        get; set;
+    }
     /// <summary>
     /// Gets or sets a value indicating whether the response headers should be inspected.
     /// </summary>
-    public bool InspectResponseHeaders { get; set; }
+    public bool InspectResponseHeaders
+    {
+        get; set;
+    }
     /// <summary>
     /// Gets the request headers to for the current request.
     /// </summary>
-    public IDictionary<string, string> RequestHeaders { get; private set; } = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
+    public RequestHeaders RequestHeaders { get; private set; } = new RequestHeaders();
     /// <summary>
     /// Gets the response headers for the current request.
     /// </summary>
-    public IDictionary<string, string> ResponseHeaders { get; private set; } = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
+    public RequestHeaders ResponseHeaders { get; private set; } = new RequestHeaders();
 }