http: fix minor issues in header handling

src/Ramstack.HtmxToolkit/HtmxRequestHeaders.cs

@@ -65,7 +65,7 @@ internal HtmxRequestHeaders(HttpRequest request) =>
     /// <remarks>
     /// The header name is <see cref="HtmxRequestHeaderNames.Request" />.
     /// </remarks>
-    public bool Request => GetBoolean(_headers, HtmxRequestHeaderNames.Request);
+    public bool Request => _headers.ContainsKey(HtmxRequestHeaderNames.Request);
 
     /// <summary>
     /// Gets the type of the expected response, either a partial or a full page.

src/Ramstack.HtmxToolkit/HtmxResponseHeaders.cs

@@ -202,7 +202,9 @@ public string Reselect
     /// <param name="value">The header value.</param>
     private static void SetHeader(IHeaderDictionary headers, string key, string? value)
     {
-        if (value is not null)
+        if (string.IsNullOrEmpty(value))
+            headers.Remove(key);
+        else
             headers[key] = value;
     }
 

src/Ramstack.HtmxToolkit/HttpRequestExtensions.cs

@@ -16,7 +16,7 @@ public static class HttpRequestExtensions
     /// otherwise, <see langword="false" />.
     /// </returns>
     public static bool IsHtmxRequest(this HttpRequest request) =>
-        request.Headers.ContainsKey(HtmxRequestHeaderNames.Request);
+        request.GetHtmxHeaders().Request;
 
     /// <summary>
     /// Determines whether the specified HTTP request is an HTMX request.
@@ -31,19 +31,19 @@ public static bool IsHtmxRequest(this HttpRequest request) =>
     public static bool IsHtmxRequest(this HttpRequest request, out HtmxRequestHeaders headers)
     {
         headers = new HtmxRequestHeaders(request);
-        return request.IsHtmxRequest();
+        return headers.Request;
     }
 
     /// <summary>
-    /// Determines whether the specified HTTP request was made using AJAX instead of a normal navigation.
+    /// Determines whether the request came from a link or form enhanced with <c>hx-boost</c>.
     /// </summary>
     /// <param name="request">The HTTP request.</param>
     /// <returns>
     /// <see langword="true" /> if the specified HTTP request is boosted;
     /// otherwise, <see langword="false" />.
     /// </returns>
     public static bool IsHtmxBoosted(this HttpRequest request) =>
-        request.Headers.TryGetValue(HtmxRequestHeaderNames.Boosted, out var value) && value is ["true"];
+        request.GetHtmxHeaders().Boosted;
 
     /// <summary>
     /// Determines whether the specified HTTP request has an <c>HX-Request-Type</c> value of <c>"full"</c>.