diff --git a/src/Microsoft.AspNetCore.Blazor.Browser.JS/src/Rendering/BrowserRenderer.ts b/src/Microsoft.AspNetCore.Blazor.Browser.JS/src/Rendering/BrowserRenderer.ts
index d3d32f3716..c457a659bc 100644
--- a/src/Microsoft.AspNetCore.Blazor.Browser.JS/src/Rendering/BrowserRenderer.ts
+++ b/src/Microsoft.AspNetCore.Blazor.Browser.JS/src/Rendering/BrowserRenderer.ts
@@ -168,19 +168,25 @@ export class BrowserRenderer {
     const browserRendererId = this.browserRendererId;
     const eventHandlerId = renderTreeFrame.attributeEventHandlerId(attributeFrame);
 
+    if (attributeName === 'value') {
+      if (this.tryApplyValueProperty(toDomElement, renderTreeFrame.attributeValue(attributeFrame))) {
+        return; // If this DOM element type has special 'value' handling, don't also write it as an attribute
+      }
+    }
+
     // TODO: Instead of applying separate event listeners to each DOM element, use event delegation
     // and remove all the _blazor*Listener hacks
     switch (attributeName) {
       case 'onclick': {
         toDomElement.removeEventListener('click', toDomElement['_blazorClickListener']);
-        const listener = () => raiseEvent(browserRendererId, componentId, eventHandlerId, 'mouse', { Type: 'click' });
+        const listener = evt => raiseEvent(evt, browserRendererId, componentId, eventHandlerId, 'mouse', { Type: 'click' });
         toDomElement['_blazorClickListener'] = listener;
         toDomElement.addEventListener('click', listener);
         break;
       }
       case 'onchange': {
         toDomElement.removeEventListener('change', toDomElement['_blazorChangeListener']);
-        const listener = evt => raiseEvent(browserRendererId, componentId, eventHandlerId, 'change', { Type: 'change', Value: evt.target.value });
+        const listener = evt => raiseEvent(evt, browserRendererId, componentId, eventHandlerId, 'change', { Type: 'change', Value: evt.target.value });
         toDomElement['_blazorChangeListener'] = listener;
         toDomElement.addEventListener('change', listener);
         break;
@@ -192,7 +198,7 @@ export class BrowserRenderer {
           // just to establish that we can pass parameters when raising events.
           // We use C#-style PascalCase on the eventInfo to simplify deserialization, but this could
           // change if we introduced a richer JSON library on the .NET side.
-          raiseEvent(browserRendererId, componentId, eventHandlerId, 'keyboard', { Type: evt.type, Key: (evt as any).key });
+          raiseEvent(evt, browserRendererId, componentId, eventHandlerId, 'keyboard', { Type: evt.type, Key: (evt as any).key });
         };
         toDomElement['_blazorKeypressListener'] = listener;
         toDomElement.addEventListener('keypress', listener);
@@ -208,6 +214,18 @@ export class BrowserRenderer {
     }
   }
 
+  tryApplyValueProperty(element: Element, value: string | null) {
+    // Certain elements have built-in behaviour for their 'value' property
+    switch (element.tagName) {
+      case 'INPUT':
+      case 'SELECT': // Note: this doen't handle <select> correctly: https://github.com/aspnet/Blazor/issues/157
+        (element as any).value = value;
+        return true;
+      default:
+        return false;
+    }
+  }
+
   insertFrameRange(componentId: number, parent: Element, childIndex: number, frames: System_Array<RenderTreeFramePointer>, startIndex: number, endIndexExcl: number): number {
     const origChildIndex = childIndex;
     for (let index = startIndex; index < endIndexExcl; index++) {
@@ -243,7 +261,9 @@ function removeAttributeFromDOM(parent: Element, childIndex: number, attributeNa
   element.removeAttribute(attributeName);
 }
 
-function raiseEvent(browserRendererId: number, componentId: number, eventHandlerId: number, eventInfoType: EventInfoType, eventInfo: any) {
+function raiseEvent(event: Event, browserRendererId: number, componentId: number, eventHandlerId: number, eventInfoType: EventInfoType, eventInfo: any) {
+  event.preventDefault();
+
   if (!raiseEventMethod) {
     raiseEventMethod = platform.findMethod(
       'Microsoft.AspNetCore.Blazor.Browser', 'Microsoft.AspNetCore.Blazor.Browser.Rendering', 'BrowserRendererEventDispatcher', 'DispatchEvent'
diff --git a/src/Microsoft.AspNetCore.Blazor.Browser.JS/src/Services/Http.ts b/src/Microsoft.AspNetCore.Blazor.Browser.JS/src/Services/Http.ts
index 4f230662c3..5edc1a7b74 100644
--- a/src/Microsoft.AspNetCore.Blazor.Browser.JS/src/Services/Http.ts
+++ b/src/Microsoft.AspNetCore.Blazor.Browser.JS/src/Services/Http.ts
@@ -1,27 +1,61 @@
 import { registerFunction } from '../Interop/RegisteredFunction';
 import { platform } from '../Environment';
-import { MethodHandle } from '../Platform/Platform';
+import { MethodHandle, System_String } from '../Platform/Platform';
 const httpClientAssembly = 'Microsoft.AspNetCore.Blazor.Browser';
 const httpClientNamespace = `${httpClientAssembly}.Services.Temporary`;
 const httpClientTypeName = 'HttpClient';
 const httpClientFullTypeName = `${httpClientNamespace}.${httpClientTypeName}`;
 let receiveResponseMethod: MethodHandle;
 
-registerFunction(`${httpClientFullTypeName}.Send`, (id: number, requestUri: string) => {
-  sendAsync(id, requestUri);
+registerFunction(`${httpClientFullTypeName}.Send`, (id: number, method: string, requestUri: string, body: string | null, headersJson: string | null) => {
+  sendAsync(id, method, requestUri, body, headersJson);
 });
 
-async function sendAsync(id: number, requestUri: string) {
+async function sendAsync(id: number, method: string, requestUri: string, body: string | null, headersJson: string | null) {
+  let response: Response;
+  let responseText: string;
   try {
-    const response = await fetch(requestUri);
-    const responseText = await response.text();
-    dispatchResponse(id, response.status, responseText, null);
+    response = await fetch(requestUri, {
+      method: method,
+      body: body,
+      headers: headersJson ? (JSON.parse(headersJson) as string[][]) : undefined
+    });
+    responseText = await response.text();
   } catch (ex) {
-    dispatchResponse(id, 0, null, ex.toString());
+    dispatchErrorResponse(id, ex.toString());
+    return;
   }
+
+  dispatchSuccessResponse(id, response, responseText);
 }
 
-function dispatchResponse(id: number, statusCode: number, responseText: string | null, errorInfo: string | null) {
+function dispatchSuccessResponse(id: number, response: Response, responseText: string) {
+  const responseDescriptor: ResponseDescriptor = {
+    StatusCode: response.status,
+    Headers: []
+  };
+  response.headers.forEach((value, name) => {
+    responseDescriptor.Headers.push([name, value]);
+  });
+
+  dispatchResponse(
+    id,
+    platform.toDotNetString(JSON.stringify(responseDescriptor)),
+    platform.toDotNetString(responseText), // TODO: Consider how to handle non-string responses
+    /* errorMessage */ null
+  );
+}
+
+function dispatchErrorResponse(id: number, errorMessage: string) {
+  dispatchResponse(
+    id,
+    /* responseDescriptor */ null,
+    /* responseText */ null,
+    platform.toDotNetString(errorMessage)
+  );
+}
+
+function dispatchResponse(id: number, responseDescriptor: System_String | null, responseText: System_String | null, errorMessage: System_String | null) {
   if (!receiveResponseMethod) {
     receiveResponseMethod = platform.findMethod(
       httpClientAssembly,
@@ -30,11 +64,20 @@ function dispatchResponse(id: number, statusCode: number, responseText: string |
       'ReceiveResponse'
     );
   }
-  
+
   platform.callMethod(receiveResponseMethod, null, [
     platform.toDotNetString(id.toString()),
-    platform.toDotNetString(statusCode.toString()),
-    responseText === null ? null : platform.toDotNetString(responseText),
-    errorInfo === null ? null : platform.toDotNetString(errorInfo.toString())
+    responseDescriptor,
+    responseText,
+    errorMessage,
   ]);
 }
+
+// Keep this in sync with the .NET equivalent in HttpClient.cs
+interface ResponseDescriptor {
+  // We don't have BodyText in here because if we did, then in the JSON-response case (which
+  // is the most common case), we'd be double-encoding it, since the entire ResponseDescriptor
+  // also gets JSON encoded. It would work but is twice the amount of string processing.
+  StatusCode: number;
+  Headers: string[][];
+}
diff --git a/src/Microsoft.AspNetCore.Blazor.Browser/Services/Temporary/HttpClient.cs b/src/Microsoft.AspNetCore.Blazor.Browser/Services/Temporary/HttpClient.cs
index bc28d147dd..c966e08ddf 100644
--- a/src/Microsoft.AspNetCore.Blazor.Browser/Services/Temporary/HttpClient.cs
+++ b/src/Microsoft.AspNetCore.Blazor.Browser/Services/Temporary/HttpClient.cs
@@ -2,9 +2,12 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using Microsoft.AspNetCore.Blazor.Browser.Interop;
+using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Net;
 using System.Net.Http;
+using System.Net.Http.Headers;
 using System.Threading.Tasks;
 
 namespace Microsoft.AspNetCore.Blazor.Browser.Services.Temporary
@@ -50,7 +53,7 @@ namespace Microsoft.AspNetCore.Blazor.Browser.Services.Temporary
             return await response.Content.ReadAsStringAsync();
         }
 
-        // <summary>
+        /// <summary>
         /// Sends a GET request to the specified URI and returns the response as
         /// an instance of <see cref="HttpResponseMessage"/> in an asynchronous
         /// operation.
@@ -58,6 +61,30 @@ namespace Microsoft.AspNetCore.Blazor.Browser.Services.Temporary
         /// <param name="requestUri">The URI the request is sent to.</param>
         /// <returns>A task representing the asynchronous operation.</returns>
         public Task<HttpResponseMessage> GetAsync(string requestUri)
+            => SendAsync(new HttpRequestMessage(HttpMethod.Get, requestUri));
+
+        /// <summary>
+        /// Sends a POST request to the specified URI and returns the response as
+        /// an instance of <see cref="HttpResponseMessage"/> in an asynchronous
+        /// operation.
+        /// </summary>
+        /// <param name="requestUri">The URI the request is sent to.</param>
+        /// <param name="content">The content for the request.</param>
+        /// <returns>A task representing the asynchronous operation.</returns>
+        public Task<HttpResponseMessage> PostAsync(string requestUri, HttpContent content)
+            => SendAsync(new HttpRequestMessage(HttpMethod.Post, requestUri)
+            {
+                Content = content
+            });
+
+        /// <summary>
+        /// Sends an HTTP request to the specified URI and returns the response as
+        /// an instance of <see cref="HttpResponseMessage"/> in an asynchronous
+        /// operation.
+        /// </summary>
+        /// <param name="request">The request to be sent.</param>
+        /// <returns>A task representing the asynchronous operation.</returns>
+        public async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request)
         {
             var tcs = new TaskCompletionSource<HttpResponseMessage>();
             int id;
@@ -67,12 +94,36 @@ namespace Microsoft.AspNetCore.Blazor.Browser.Services.Temporary
                 _pendingRequests.Add(id, tcs);
             }
 
-            RegisteredFunction.Invoke<object>($"{typeof(HttpClient).FullName}.Send", id, requestUri);
+            RegisteredFunction.Invoke<object>(
+                $"{typeof(HttpClient).FullName}.Send",
+                id,
+                request.Method.Method,
+                request.RequestUri.ToString(),
+                request.Content == null ? null : await GetContentAsString(request.Content),
+                SerializeHeadersAsJson(request));
 
-            return tcs.Task;
+            return await tcs.Task;
         }
 
-        private static void ReceiveResponse(string id, string statusCode, string responseText, string errorText)
+        private string SerializeHeadersAsJson(HttpRequestMessage request)
+            => Json.Serialize(
+                (from header in request.Headers.Concat(request.Content?.Headers ?? Enumerable.Empty<KeyValuePair<string, IEnumerable<string>>>())
+                from headerValue in header.Value // There can be more than one value for each name
+                select new[] { header.Key, headerValue }).ToList()
+            );
+
+        private static async Task<string> GetContentAsString(HttpContent content)
+            => content is StringContent stringContent
+                ? await stringContent.ReadAsStringAsync()
+                : throw new InvalidOperationException($"Currently, {typeof(HttpClient).FullName} " +
+                    $"only supports contents of type {nameof(StringContent)}, but you supplied " +
+                    $"{content.GetType().FullName}.");
+
+        private static void ReceiveResponse(
+            string id,
+            string responseDescriptorJson,
+            string responseBodyText,
+            string errorText)
         {
             TaskCompletionSource<HttpResponseMessage> tcs;
             var idVal = int.Parse(id);
@@ -82,17 +133,42 @@ namespace Microsoft.AspNetCore.Blazor.Browser.Services.Temporary
                 _pendingRequests.Remove(idVal);
             }
 
-            if (errorText == null)
+            if (errorText != null)
             {
-                tcs.SetResult(new HttpResponseMessage
-                {
-                    StatusCode = (HttpStatusCode)int.Parse(statusCode),
-                    Content = new StringContent(responseText)
-                });
+                tcs.SetException(new HttpRequestException(errorText));
             }
             else
             {
-                tcs.SetException(new HttpRequestException(errorText));
+                var responseDescriptor = Json.Deserialize<ResponseDescriptor>(responseDescriptorJson);
+                var responseContent = responseBodyText == null ? null : new StringContent(responseBodyText);
+                var responseMessage = responseDescriptor.ToResponseMessage(responseContent);
+                tcs.SetResult(responseMessage);
+            }
+        }
+
+        // Keep in sync with TypeScript class in Http.ts
+        private class ResponseDescriptor
+        {
+            #pragma warning disable 0649
+            public int StatusCode { get; set; }
+            public string[][] Headers { get; set; }
+            #pragma warning restore 0649
+
+            public HttpResponseMessage ToResponseMessage(HttpContent content)
+            {
+                var result = new HttpResponseMessage((HttpStatusCode)StatusCode);
+                result.Content = content;
+                var headers = result.Headers;
+                var contentHeaders = result.Content?.Headers;
+                foreach (var pair in Headers)
+                {
+                    if (!headers.TryAddWithoutValidation(pair[0], pair[1]))
+                    {
+                        contentHeaders?.TryAddWithoutValidation(pair[0], pair[1]);
+                    }
+                }
+
+                return result;
             }
         }
     }
diff --git a/test/Microsoft.AspNetCore.Blazor.E2ETest/Microsoft.AspNetCore.Blazor.E2ETest.csproj b/test/Microsoft.AspNetCore.Blazor.E2ETest/Microsoft.AspNetCore.Blazor.E2ETest.csproj
index 9f22f62217..8b44cc3d52 100644
--- a/test/Microsoft.AspNetCore.Blazor.E2ETest/Microsoft.AspNetCore.Blazor.E2ETest.csproj
+++ b/test/Microsoft.AspNetCore.Blazor.E2ETest/Microsoft.AspNetCore.Blazor.E2ETest.csproj
@@ -10,6 +10,7 @@
     <PackageReference Include="Microsoft.AspNetCore.Server.Kestrel" Version="2.0.1" />
     <PackageReference Include="Microsoft.AspNetCore.StaticFiles" Version="2.0.1" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.5.0" />
+    <PackageReference Include="Selenium.Support" Version="3.8.0" />
     <PackageReference Include="Selenium.WebDriver" Version="3.8.0" />
     <PackageReference Include="xunit" Version="2.3.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.3.1" />
diff --git a/test/Microsoft.AspNetCore.Blazor.E2ETest/Tests/HttpClientTest.cs b/test/Microsoft.AspNetCore.Blazor.E2ETest/Tests/HttpClientTest.cs
index 58d67c6f64..0a053681b3 100644
--- a/test/Microsoft.AspNetCore.Blazor.E2ETest/Tests/HttpClientTest.cs
+++ b/test/Microsoft.AspNetCore.Blazor.E2ETest/Tests/HttpClientTest.cs
@@ -1,8 +1,11 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using BasicTestApp.HttpClientTest;
 using Microsoft.AspNetCore.Blazor.E2ETest.Infrastructure;
 using Microsoft.AspNetCore.Blazor.E2ETest.Infrastructure.ServerFixtures;
+using OpenQA.Selenium;
+using OpenQA.Selenium.Support.UI;
 using System;
 using System.Net.Http;
 using System.Threading.Tasks;
@@ -13,6 +16,10 @@ namespace Microsoft.AspNetCore.Blazor.E2ETest.Tests
     public class HttpClientTest : BasicTestAppTestBase, IClassFixture<AspNetSiteServerFixture>
     {
         readonly ServerFixture _apiServerFixture;
+        readonly IWebElement _appElement;
+        IWebElement _responseStatus;
+        IWebElement _responseBody;
+        IWebElement _responseHeaders;
 
         public HttpClientTest(
             BrowserFixture browserFixture,
@@ -23,7 +30,8 @@ namespace Microsoft.AspNetCore.Blazor.E2ETest.Tests
             apiServerFixture.BuildWebHostMethod = TestServer.Program.BuildWebHost;
             _apiServerFixture = apiServerFixture;
 
-            //Navigate(ServerPathBase, noReload: true);
+            Navigate(ServerPathBase, noReload: true);
+            _appElement = MountTestComponent<HttpRequestsComponent>();
         }
 
         [Fact]
@@ -36,5 +44,91 @@ namespace Microsoft.AspNetCore.Blazor.E2ETest.Tests
             var responseText = await httpClient.GetStringAsync("/api/greeting/sayhello");
             Assert.Equal("Hello", responseText);
         }
+
+        [Fact]
+        public void CanPerformGetRequest()
+        {
+            IssueRequest("GET", "/api/person");
+            Assert.Equal("OK", _responseStatus.Text);
+            Assert.Equal("[\"value1\",\"value2\"]", _responseBody.Text);
+        }
+
+        [Fact]
+        public void CanPerformPostRequestWithBody()
+        {
+            var testMessage = $"The value is {Guid.NewGuid()}";
+            IssueRequest("POST", "/api/person", testMessage);
+            Assert.Equal("OK", _responseStatus.Text);
+            Assert.Equal($"You posted: {testMessage}", _responseBody.Text);
+        }
+
+        [Fact]
+        public void CanReadResponseHeaders()
+        {
+            IssueRequest("GET", "/api/person");
+            Assert.Equal("OK", _responseStatus.Text);
+
+            // Note that we only see header names case insensitively. The 'fetch' API
+            // can use whatever casing rules it wants, because the HTTP spec says the
+            // names are case-insensitive. In practice, Chrome lowercases them all.
+            // Ideally we should make the test case-insensitive for header name, but
+            // case-sensitive for header value.
+            Assert.Contains("mycustomheader: My custom value", _responseHeaders.Text);
+        }
+
+        [Fact]
+        public void CanSendRequestHeaders()
+        {
+            AddRequestHeader("TestHeader", "Value from test");
+            AddRequestHeader("another-header", "Another value");
+            IssueRequest("DELETE", "/api/person");
+            Assert.Equal("OK", _responseStatus.Text);
+            Assert.Contains("TestHeader: Value from test", _responseBody.Text);
+            Assert.Contains("another-header: Another value", _responseBody.Text);
+        }
+
+        [Fact]
+        public void CanSendAndReceiveJson()
+        {
+            AddRequestHeader("Content-Type", "application/json");
+            IssueRequest("PUT", "/api/person", "{\"Name\": \"Bert\", \"Id\": 123}");
+            Assert.Equal("OK", _responseStatus.Text);
+            Assert.Contains("Content-Type: application/json", _responseHeaders.Text);
+            Assert.Equal("{\"id\":123,\"name\":\"Bert\"}", _responseBody.Text);
+        }
+
+        private void IssueRequest(string requestMethod, string relativeUri, string requestBody = null)
+        {
+            var targetUri = new Uri(_apiServerFixture.RootUri, relativeUri);
+            SetValue("request-uri", targetUri.AbsoluteUri);
+            SetValue("request-body", requestBody ?? string.Empty);
+            new SelectElement(Browser.FindElement(By.Id("request-method")))
+                .SelectByText(requestMethod);
+
+            _appElement.FindElement(By.Id("send-request")).Click();
+
+            new WebDriverWait(Browser, TimeSpan.FromSeconds(30)).Until(
+                driver => driver.FindElement(By.Id("response-status")) != null);
+            _responseStatus = _appElement.FindElement(By.Id("response-status"));
+            _responseBody = _appElement.FindElement(By.Id("response-body"));
+            _responseHeaders = _appElement.FindElement(By.Id("response-headers"));
+        }
+
+        private void AddRequestHeader(string name, string value)
+        {
+            var addHeaderButton = _appElement.FindElement(By.Id("add-header"));
+            addHeaderButton.Click();
+            var newHeaderEntry = _appElement.FindElement(By.CssSelector(".header-entry:last-of-type"));
+            var textBoxes = newHeaderEntry.FindElements(By.TagName("input"));
+            textBoxes[0].SendKeys(name);
+            textBoxes[1].SendKeys(value);
+        }
+
+        private void SetValue(string elementId, string value)
+        {
+            var element = Browser.FindElement(By.Id(elementId));
+            element.Clear();
+            element.SendKeys(value);
+        }
     }
 }
diff --git a/test/testapps/BasicTestApp/HttpClientTest/HttpRequestsComponent.cshtml b/test/testapps/BasicTestApp/HttpClientTest/HttpRequestsComponent.cshtml
new file mode 100644
index 0000000000..34af7864a8
--- /dev/null
+++ b/test/testapps/BasicTestApp/HttpClientTest/HttpRequestsComponent.cshtml
@@ -0,0 +1,123 @@
+@using System.Net
+@using System.Net.Http
+@inject Microsoft.AspNetCore.Blazor.Browser.Services.Temporary.HttpClient Http
+
+<h1>HTTP request tester</h1>
+
+<p>
+    <div>URI:</div>
+    <input id="request-uri" value=@uri @onchange(value => { uri = (string)value; }) size="60"/>
+</p>
+
+<p>
+    <div>Method:</div>
+    <select id="request-method" value=@method @onchange(value => { method = (string)value; })>
+        <option value="GET">GET</option>
+        <option value="POST">POST</option>
+        <option value="PUT">PUT</option>
+        <option value="DELETE">DELETE</option>
+    </select>
+</p>
+
+<p>
+    <div>Request body:</div>
+    <textarea id="request-body" value=@requestBody @onchange(value => { requestBody = (string)value; })></textarea>
+</p>
+
+<p>
+    <div>Request headers:</div>
+    @foreach (var header in requestHeaders)
+    {
+        <div class="header-entry">
+            Name: <input value=@header.Name @onchange(value => { header.Name = (string)value; }) />
+            Value: <input value=@header.Value @onchange(value => { header.Value = (string)value; }) />
+            [<a href="#" @onclick(() => RemoveHeader(header))>remove</a>]
+        </div>
+    }
+    <button id="add-header" @onclick(AddHeader)>Add</button>
+</p>
+
+<button id="send-request" @onclick(DoRequest)>Request</button>
+
+@if (responseStatusCode.HasValue)
+{
+    <h2>Response</h2>
+    <p><div>Status:</div><span id="response-status">@responseStatusCode</span></p>
+    <p><div>Body:</div><textarea id="response-body" readonly>@responseBody</textarea></p>
+    <p><div>Headers:</div><textarea id="response-headers" readonly>@responseHeaders</textarea></p>
+}
+
+<style type="text/css">
+    textarea {
+        width: 100%;
+        height: 60px;
+    }
+</style>
+
+@functions {
+    string uri = "http://api.icndb.com/jokes/random";
+    string method = "GET";
+    string requestBody = "";
+    List<RequestHeader> requestHeaders = new List<RequestHeader>();
+
+    HttpStatusCode? responseStatusCode;
+    string responseBody;
+    string responseHeaders;
+
+    async void DoRequest()
+    {
+        responseStatusCode = null;
+
+        try
+        {
+            var requestMessage = new HttpRequestMessage()
+            {
+                Method = new HttpMethod(method),
+                RequestUri = new Uri(uri),
+                Content = string.IsNullOrEmpty(requestBody)
+                    ? null
+                    : new StringContent(requestBody)
+            };
+
+            foreach (var header in requestHeaders)
+            {
+                if (!requestMessage.Headers.TryAddWithoutValidation(header.Name, header.Value))
+                {
+                    requestMessage.Content?.Headers.TryAddWithoutValidation(header.Name, header.Value);
+                }
+            }
+
+            var response = await Http.SendAsync(requestMessage);
+            responseStatusCode = response.StatusCode;
+            responseBody = await response.Content.ReadAsStringAsync();
+            var allHeaders = response.Headers.Concat(response.Content?.Headers
+                ?? Enumerable.Empty<KeyValuePair<string, IEnumerable<string>>>());
+            responseHeaders = string.Join(
+                Environment.NewLine,
+                allHeaders.Select(pair => $"{pair.Key}: {pair.Value.First()}").ToArray());
+        }
+        catch (Exception ex)
+        {
+            if (ex is AggregateException)
+            {
+                ex = ex.InnerException;
+            }
+            responseStatusCode = HttpStatusCode.SeeOther;
+            responseBody = ex.Message + Environment.NewLine + ex.StackTrace;
+        }
+
+        StateHasChanged();
+    }
+
+    void AddHeader()
+        => requestHeaders.Add(new RequestHeader());
+
+    void RemoveHeader(RequestHeader header)
+        => requestHeaders.Remove(header);
+
+    class RequestHeader
+    {
+        public string Name { get; set; }
+        public string Value { get; set; }
+    }
+}
diff --git a/test/testapps/BasicTestApp/RouterTest/TestRouter.cshtml b/test/testapps/BasicTestApp/RouterTest/TestRouter.cshtml
index c628df304d..7f16328038 100644
--- a/test/testapps/BasicTestApp/RouterTest/TestRouter.cshtml
+++ b/test/testapps/BasicTestApp/RouterTest/TestRouter.cshtml
@@ -1,4 +1,4 @@
 @using Microsoft.AspNetCore.Blazor.Routing
 <c:Router AppAssembly=@(typeof(BasicTestApp.Program).Assembly)
-                 PagesNamespace=@nameof(BasicTestApp)
-                 DefaultComponentName=@("Default") />
+          PagesNamespace=@nameof(BasicTestApp)
+          DefaultComponentName=@("Default") />
diff --git a/test/testapps/BasicTestApp/wwwroot/index.html b/test/testapps/BasicTestApp/wwwroot/index.html
index 97a440d873..c0e976bb97 100644
--- a/test/testapps/BasicTestApp/wwwroot/index.html
+++ b/test/testapps/BasicTestApp/wwwroot/index.html
@@ -6,16 +6,44 @@
     <base href="/subdir/" />
 </head>
 <body>
+  <div id="test-selector" style="display: none">
+    Select test:
+    <select onchange="mountTestComponent(event.target.value)">
+      <option value="">Choose...</option>
+      <option value="BasicTestApp.AddRemoveChildComponents">Add/remove child components</option>
+      <option value="BasicTestApp.CounterComponent">Counter</option>
+      <option value="BasicTestApp.CounterComponentUsingChild">Counter using child component</option>
+      <option value="BasicTestApp.CounterComponentWrapper">Counter wrapped in parent</option>
+      <option value="BasicTestApp.KeyPressEventComponent">Key press event</option>
+      <option value="BasicTestApp.ParentChildComponent">Parent component with child</option>
+      <option value="BasicTestApp.PropertiesChangedHandlerParent">Parent component that changes parameters on child</option>
+      <option value="BasicTestApp.RedTextComponent">Red text</option>
+      <option value="BasicTestApp.RenderFragmentToggler">Render fragment renderer</option>
+      <option value="BasicTestApp.TextOnlyComponent">Plain text</option>
+      <option value="BasicTestApp.HierarchicalImportsTest.Subdir.ComponentUsingImports">Imports statement</option>
+      <option value="BasicTestApp.HttpClientTest.HttpRequestsComponent">HttpClient tester</option>
+      <!--<option value="BasicTestApp.RouterTest.Default">Router</option> Excluded because it requires additional setup to work correctly when loaded manually -->
+    </select>
+    &nbsp;
+    <span id="source-info"></span>
+    <hr />
+  </div>
+
   <app>Loading...</app>
 
   <script type="blazor-boot"></script>
   <script>
     // The client-side .NET code calls this when it is ready to be called from test code
     // The Xunit test code polls until it sees the flag is set
-    Blazor.registerFunction('testReady', function () { window.isTestReady = true; });
+    Blazor.registerFunction('testReady', function () {
+        window.isTestReady = true;
+        document.getElementsByTagName('APP')[0].textContent = '';
+        document.getElementById('test-selector').style.display = 'block';
+    });
 
     // The Xunit test code calls this when setting up tests for specific components
     function mountTestComponent(typeName) {
+      document.getElementById('source-info').innerHTML = '<code><tt>' + typeName.replace(/\./g, '/') + '.cshtml</code></strong>';
       var method = Blazor.platform.findMethod('BasicTestApp', 'BasicTestApp', 'Program', 'MountTestComponent');
       Blazor.platform.callMethod(method, null, [Blazor.platform.toDotNetString(typeName)]);
     }
diff --git a/test/testapps/TestServer/Controllers/PersonController.cs b/test/testapps/TestServer/Controllers/PersonController.cs
index 07e166d5e5..f765566e52 100644
--- a/test/testapps/TestServer/Controllers/PersonController.cs
+++ b/test/testapps/TestServer/Controllers/PersonController.cs
@@ -1,41 +1,60 @@
 using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Cors;
 using Microsoft.AspNetCore.Mvc;
 
 namespace TestServer.Controllers
 {
+    [EnableCors("AllowAll")]
     [Route("api/[controller]")]
     public class PersonController : Controller
     {
-        // GET api/values
+        // GET api/person
         [HttpGet]
         public IEnumerable<string> Get()
         {
+            HttpContext.Response.Headers.Add("MyCustomHeader", "My custom value");
             return new string[] { "value1", "value2" };
         }
 
-        // GET api/values/5
-        [HttpGet("{id}")]
-        public string Get(int id)
-        {
-            return "value";
-        }
-
-        // POST api/values
+        // POST api/person
         [HttpPost]
-        public void Post([FromBody]string value)
+        public async Task<string> Post()
         {
+            using (var reader = new StreamReader(Request.Body))
+            {
+                var plainTextBodyContent = await reader.ReadToEndAsync();
+                return $"You posted: {plainTextBodyContent}";
+            }
         }
 
-        // PUT api/values/5
-        [HttpPut("{id}")]
-        public void Put(int id, [FromBody]string value)
+        // PUT api/person
+        [HttpPut]
+        public Person Put([FromBody, Required] Person person)
         {
+            return person;
         }
 
-        // DELETE api/values/5
-        [HttpDelete("{id}")]
-        public void Delete(int id)
+        // DELETE api/person
+        [HttpDelete]
+        public string Delete()
         {
+            var result = new StringBuilder();
+            foreach (var header in Request.Headers)
+            {
+                result.AppendLine($"{header.Key}: {string.Join(",", header.Value.ToArray())}");
+            }
+            return "REQUEST HEADERS:\n" + result.ToString();
+        }
+
+        public class Person
+        {
+            public int Id { get; set; }
+            public string Name { get; set; }
         }
     }
 }
diff --git a/test/testapps/TestServer/Startup.cs b/test/testapps/TestServer/Startup.cs
index 22ef5544db..3889da67be 100644
--- a/test/testapps/TestServer/Startup.cs
+++ b/test/testapps/TestServer/Startup.cs
@@ -18,6 +18,17 @@ namespace TestServer
         public void ConfigureServices(IServiceCollection services)
         {
             services.AddMvc();
+            services.AddCors(options =>
+            {
+                options.AddPolicy("AllowAll", builder =>
+                {
+                    builder
+                        .AllowAnyOrigin()
+                        .AllowAnyHeader()
+                        .AllowAnyMethod()
+                        .WithExposedHeaders("MyCustomHeader");
+                });
+            });
         }
 
         // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.