Add project files.

.dockerignore

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+**/.classpath
+**/.dockerignore
+**/.env
+**/.git
+**/.gitignore
+**/.project
+**/.settings
+**/.toolstarget
+**/.vs
+**/.vscode
+**/*.*proj.user
+**/*.dbmdl
+**/*.jfm
+**/azds.yaml
+**/bin
+**/charts
+**/docker-compose*
+**/Dockerfile*
+**/node_modules
+**/npm-debug.log
+**/obj
+**/secrets.dev.yaml
+**/values.dev.yaml
+LICENSE
+README.md

CloudFlareReverseProxy.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.31911.196
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CloudFlareReverseProxy", "CloudFlareReverseProxy\CloudFlareReverseProxy.csproj", "{EA43FF3F-964F-4982-8C79-B4DB77AB7FEF}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{EA43FF3F-964F-4982-8C79-B4DB77AB7FEF}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{EA43FF3F-964F-4982-8C79-B4DB77AB7FEF}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{EA43FF3F-964F-4982-8C79-B4DB77AB7FEF}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{EA43FF3F-964F-4982-8C79-B4DB77AB7FEF}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {1983598E-E53B-4CDD-A7FA-E15EB8F3DB9A}
+	EndGlobalSection
+EndGlobal

CloudFlareReverseProxy/CloudFlareReverseProxy.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net5.0</TargetFramework>
+    <UserSecretsId>fe0043e8-ea3b-4937-b2a1-fb2af7fe92d6</UserSecretsId>
+    <DockerDefaultTargetOS>Linux</DockerDefaultTargetOS>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="FlareSolverrSharp" Version="2.1.0" />
+    <PackageReference Include="Microsoft.VisualStudio.Azure.Containers.Tools.Targets" Version="1.11.1" />
+  </ItemGroup>
+
+</Project>

CloudFlareReverseProxy/Dockerfile

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+#See https://aka.ms/containerfastmode to understand how Visual Studio uses this Dockerfile to build your images for faster debugging.
+
+FROM mcr.microsoft.com/dotnet/aspnet:5.0 AS base
+WORKDIR /app
+EXPOSE 80
+EXPOSE 443
+
+FROM mcr.microsoft.com/dotnet/sdk:5.0 AS build
+WORKDIR /src
+COPY ["CloudFlareReverseProxy/CloudFlareReverseProxy.csproj", "CloudFlareReverseProxy/"]
+RUN dotnet restore "CloudFlareReverseProxy/CloudFlareReverseProxy.csproj"
+COPY . .
+WORKDIR "/src/CloudFlareReverseProxy"
+RUN dotnet build "CloudFlareReverseProxy.csproj" -c Release -o /app/build
+
+FROM build AS publish
+RUN dotnet publish "CloudFlareReverseProxy.csproj" -c Release -o /app/publish
+
+FROM base AS final
+WORKDIR /app
+COPY --from=publish /app/publish .
+ENTRYPOINT ["dotnet", "CloudFlareReverseProxy.dll"]

CloudFlareReverseProxy/Program.cs

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+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace CloudFlareReverseProxy
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            CreateHostBuilder(args).Build().Run();
+        }
+
+        public static IHostBuilder CreateHostBuilder(string[] args) =>
+            Host.CreateDefaultBuilder(args)
+                .ConfigureWebHostDefaults(webBuilder =>
+                {
+                    webBuilder.UseStartup<Startup>();
+                });
+    }
+}

CloudFlareReverseProxy/Properties/launchSettings.json

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+{
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:40939",
+      "sslPort": 0
+    }
+  },
+  "profiles": {
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "CloudFlareReverseProxy": {
+      "commandName": "Project",
+      "launchBrowser": true,
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      },
+      "dotnetRunMessages": "true",
+      "applicationUrl": "https://localhost:5001;http://localhost:5000"
+    },
+    "Docker": {
+      "commandName": "Docker",
+      "launchBrowser": true,
+      "launchUrl": "{Scheme}://{ServiceHost}:{ServicePort}",
+      "publishAllPorts": true,
+      "useSSL": true
+    }
+  }
+}

CloudFlareReverseProxy/ReverseProxyMiddleware.cs

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+using FlareSolverrSharp;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.WebUtilities;
+using Microsoft.Extensions.Configuration;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.Http;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CloudFlareReverseProxy
+{
+    public class ReverseProxyMiddleware
+    {
+        private static HttpClient _httpClient;
+        private readonly RequestDelegate _nextMiddleware;
+
+        public ReverseProxyMiddleware(RequestDelegate nextMiddleware, IConfiguration configuration)
+        {
+            _nextMiddleware = nextMiddleware;
+            var handler = new ClearanceHandler(configuration["FlareSolverrApiUrl"])
+            {
+                MaxTimeout = 60000
+            };
+            _httpClient = new HttpClient(handler);
+        }
+
+        public async Task Invoke(HttpContext context)
+        {
+            var targetUri = BuildTargetUri(context.Request);
+
+            if (targetUri != null)
+            {
+                var targetRequestMessage = CreateTargetMessage(context, targetUri);
+
+                using (var responseMessage = await _httpClient.SendAsync(targetRequestMessage, HttpCompletionOption.ResponseHeadersRead, context.RequestAborted))
+                {
+                    context.Response.StatusCode = (int)responseMessage.StatusCode;
+
+                    CopyFromTargetResponseHeaders(context, responseMessage);
+
+                    await ProcessResponseContent(context, responseMessage);
+                }
+
+                return;
+            }
+
+            await _nextMiddleware(context);
+        }
+
+        private async Task ProcessResponseContent(HttpContext context, HttpResponseMessage responseMessage)
+        {
+            var content = await responseMessage.Content.ReadAsByteArrayAsync();
+
+            if (IsContentOfType(responseMessage, "text/html") || IsContentOfType(responseMessage, "text/javascript"))
+            {
+                var stringContent = Encoding.UTF8.GetString(content);
+                var newContent = stringContent.Replace("https://www.google.com", "/google")
+                    .Replace("https://www.gstatic.com", "/googlestatic")
+                    .Replace("https://docs.google.com/forms", "/googleforms");
+                await context.Response.WriteAsync(newContent, Encoding.UTF8);
+            }
+            else
+            {
+                await context.Response.Body.WriteAsync(content);
+            }
+        }
+
+        private bool IsContentOfType(HttpResponseMessage responseMessage, string type)
+        {
+            var result = false;
+
+            if (responseMessage.Content?.Headers?.ContentType != null)
+            {
+                result = responseMessage.Content.Headers.ContentType.MediaType == type;
+            }
+
+            return result;
+        }
+
+        private HttpRequestMessage CreateTargetMessage(HttpContext context, Uri targetUri)
+        {
+            var requestMessage = new HttpRequestMessage();
+            CopyFromOriginalRequestContentAndHeaders(context, requestMessage);
+
+            //targetUri = new Uri(QueryHelpers.AddQueryString(targetUri.OriginalString, new Dictionary<string, string>() { { "entry.1884265043", "John Doe" } }));
+
+            requestMessage.RequestUri = targetUri;
+            requestMessage.Headers.Host = targetUri.Host;
+            requestMessage.Method = GetMethod(context.Request.Method);
+
+            return requestMessage;
+        }
+
+        private void CopyFromOriginalRequestContentAndHeaders(HttpContext context, HttpRequestMessage requestMessage)
+        {
+            var requestMethod = context.Request.Method;
+
+            if (!HttpMethods.IsGet(requestMethod) &&
+                !HttpMethods.IsHead(requestMethod) &&
+                !HttpMethods.IsDelete(requestMethod) &&
+                !HttpMethods.IsTrace(requestMethod))
+            {
+                var streamContent = new StreamContent(context.Request.Body);
+                requestMessage.Content = streamContent;
+            }
+
+            foreach (var header in context.Request.Headers)
+            {
+                requestMessage.Content?.Headers.TryAddWithoutValidation(header.Key, header.Value.ToArray());
+            }
+        }
+
+        private void CopyFromTargetResponseHeaders(HttpContext context, HttpResponseMessage responseMessage)
+        {
+            foreach (var header in responseMessage.Headers)
+            {
+                context.Response.Headers[header.Key] = header.Value.ToArray();
+            }
+
+            foreach (var header in responseMessage.Content.Headers)
+            {
+                context.Response.Headers[header.Key] = header.Value.ToArray();
+            }
+            context.Response.Headers.Remove("transfer-encoding");
+        }
+        private static HttpMethod GetMethod(string method)
+        {
+            if (HttpMethods.IsDelete(method)) return HttpMethod.Delete;
+            if (HttpMethods.IsGet(method)) return HttpMethod.Get;
+            if (HttpMethods.IsHead(method)) return HttpMethod.Head;
+            if (HttpMethods.IsOptions(method)) return HttpMethod.Options;
+            if (HttpMethods.IsPost(method)) return HttpMethod.Post;
+            if (HttpMethods.IsPut(method)) return HttpMethod.Put;
+            if (HttpMethods.IsTrace(method)) return HttpMethod.Trace;
+            return new HttpMethod(method);
+        }
+
+        private Uri BuildTargetUri(HttpRequest request)
+        {
+            Uri targetUri = null;
+            //PathString remainingPath;
+
+            /*
+            if (request.Path.StartsWithSegments("/googleforms", out remainingPath))
+            {
+                targetUri = new Uri("https://docs.google.com/forms" + remainingPath);
+            }
+
+            if (request.Path.StartsWithSegments("/google", out remainingPath))
+            {
+                targetUri = new Uri("https://www.google.com" + remainingPath);
+            }
+
+            if (request.Path.StartsWithSegments("/googlestatic", out remainingPath))
+            {
+                targetUri = new Uri(" https://www.gstatic.com" + remainingPath);
+            }
+            */
+            if (!request.Query["url"].Any())
+                return targetUri;
+            else
+                return new Uri(Uri.UnescapeDataString(request.Query["url"].ToString()));
+        }
+    }
+}

CloudFlareReverseProxy/Startup.cs

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+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace CloudFlareReverseProxy
+{
+    public class Startup
+    {
+        // This method gets called by the runtime. Use this method to add services to the container.
+        // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
+        public void ConfigureServices(IServiceCollection services)
+        {
+        }
+
+        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
+        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
+        {
+            if (env.IsDevelopment())
+            {
+                app.UseDeveloperExceptionPage();
+            }
+
+            //app.UseRouting();
+            app.UseMiddleware<ReverseProxyMiddleware>();
+
+            /*
+            app.UseEndpoints(endpoints =>
+            {
+                endpoints.MapGet("/", async context =>
+                {
+                    await context.Response.WriteAsync("Hello World!");
+                });
+            });
+            */
+        }
+    }
+}

CloudFlareReverseProxy/appsettings.Development.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft": "Warning",
+      "Microsoft.Hosting.Lifetime": "Information"
+    }
+  }
+}

CloudFlareReverseProxy/appsettings.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft": "Warning",
+      "Microsoft.Hosting.Lifetime": "Information"
+    }
+  },
+  "AllowedHosts": "*",
+  "FlareSolverrApiUrl": "http://basilisk.chrispr.lan:8191"
+}