Allow HTTP content headers to be sent

Author: SteveDesmond-ca

src/Factory.cs

@@ -40,11 +40,27 @@ public static HttpRequestMessage Message(ToolSettings settings)
 			Content = new StringContent(settings.Body)
 		};
 
-		foreach (var header in settings.Headers)
+		var contentHeaders = settings.Headers.Where(h => h == "Allow" || h.StartsWith("Content")).ToArray();
+		foreach (var header in contentHeaders)
 		{
 			var split = header.Split(':');
 			var name = split[0].Trim();
 			var value = split[1].Trim();
+
+			if (message.Content.Headers.Any(h => h.Key == name))
+				message.Content.Headers.Remove(name);
+			message.Content.Headers.Add(name, value);
+		}
+
+		var requestHeaders = settings.Headers.Except(contentHeaders).ToArray();
+		foreach (var header in requestHeaders)
+		{
+			var split = header.Split(':');
+			var name = split[0].Trim();
+			var value = split[1].Trim();
+
+			if (message.Headers.Any(h => h.Key == name))
+				message.Headers.Remove(name);
 			message.Headers.Add(name, value);
 		}
 

test/FactoryTests.cs

@@ -25,7 +25,7 @@ public async Task CanCreateComplexMessage()
 		{
 			URL = new Uri("http://localhost"),
 			Method = HttpMethod.Post.Method,
-			Headers = ["Authorization: Basic a1b2c3d4e5f6"],
+			Headers = ["Authorization: Basic a1b2c3d4e5f6", "Content-Type: application/json"],
 			Body = """{"key123":"value456"}"""
 		};
 
@@ -36,6 +36,8 @@ public async Task CanCreateComplexMessage()
 		Assert.Equal(HttpMethod.Post, message.Method);
 		Assert.Contains("Authorization", message.Headers.Select(h => h.Key));
 		Assert.Contains("Basic a1b2c3d4e5f6", message.Headers.Select(h => h.Value.FirstOrDefault()));
+		Assert.Contains("Content-Type", message.Content!.Headers.Select(h => h.Key));
+		Assert.Contains("application/json", message.Content!.Headers.Select(h => h.Value.FirstOrDefault()));
 
 		var json = await JsonSerializer.DeserializeAsync<JsonElement>(await message.Content!.ReadAsStreamAsync());
 		Assert.Equal("value456", json.GetProperty("key123").GetString());