Update ClientPipelineApi, HttpMessageApi abstraction (#4816)

- Remove unused `ClientPipelineApi.CreateMessage`
- Add `HttpRequestOptionsApi` to `ClientPipelineApi.Send(Async)`
- Replace `HttpMessageApi.ResponseClassifier` with
`HttpMessageApi.ApplyResponseClassifier`
- Make abstraction more generic

This fix is needed for below issues of Azure plugin:
https://github.com/Azure/azure-sdk-for-net/issues/46899
https://github.com/Azure/azure-sdk-for-net/issues/46900
https://github.com/Azure/azure-sdk-for-net/issues/46901
https://github.com/Azure/azure-sdk-for-net/issues/46902

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/src/Providers/Abstractions/ClientPipelineApi.cs

@@ -4,7 +4,9 @@
 using System;
 using Microsoft.Generator.CSharp.Expressions;
 using Microsoft.Generator.CSharp.Primitives;
+using Microsoft.Generator.CSharp.Providers;
 using Microsoft.Generator.CSharp.Snippets;
+using Microsoft.Generator.CSharp.Statements;
 
 namespace Microsoft.Generator.CSharp.ClientModel.Providers
 {
@@ -18,13 +20,11 @@ namespace Microsoft.Generator.CSharp.ClientModel.Providers
         {
         }
 
-        public abstract HttpMessageApi CreateMessage();
-
         public abstract ValueExpression CreateMessage(HttpRequestOptionsApi requestOptions, ValueExpression responseClassifier);
 
-        public abstract InvokeMethodExpression Send(HttpMessageApi message);
+        public abstract MethodBodyStatement Send(HttpMessageApi message, HttpRequestOptionsApi options);
 
-        public abstract InvokeMethodExpression SendAsync(HttpMessageApi message);
+        public abstract MethodBodyStatement SendAsync(HttpMessageApi message, HttpRequestOptionsApi options);
 
         public abstract ValueExpression Create(ValueExpression options, ValueExpression perRetryPolicies);
 

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/src/Providers/Abstractions/HttpMessageApi.cs

@@ -21,9 +21,9 @@ namespace Microsoft.Generator.CSharp.ClientModel.Providers
 
         public abstract ValueExpression BufferResponse();
 
-        public abstract ValueExpression ResponseClassifier();
+        public abstract MethodBodyStatement ApplyResponseClassifier(StatusCodeClassifierApi statusCodeClassifier);
 
-        public abstract MethodBodyStatement Apply(ValueExpression options);
+        public abstract MethodBodyStatement ApplyRequestOptions(HttpRequestOptionsApi options);
 
         public abstract MethodBodyStatement[] ExtractResponse();
 

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/src/Providers/Abstractions/HttpRequestApi.cs

@@ -6,6 +6,7 @@ using System.Collections.Generic;
 using Microsoft.Generator.CSharp.Expressions;
 using Microsoft.Generator.CSharp.Primitives;
 using Microsoft.Generator.CSharp.Snippets;
+using Microsoft.Generator.CSharp.Statements;
 
 namespace Microsoft.Generator.CSharp.ClientModel.Providers
 {
@@ -15,11 +16,11 @@ namespace Microsoft.Generator.CSharp.ClientModel.Providers
         {
         }
 
-        public abstract AssignmentExpression SetMethod(string httpMethod);
+        public abstract MethodBodyStatement SetMethod(string httpMethod);
 
-        public abstract AssignmentExpression SetUri(ValueExpression uri);
+        public abstract MethodBodyStatement SetUri(ValueExpression uri);
 
-        public abstract InvokeMethodExpression SetHeaders(IReadOnlyList<ValueExpression> arguments);
+        public abstract MethodBodyStatement SetHeaders(IReadOnlyList<ValueExpression> arguments);
 
         public abstract ValueExpression Content();
         public abstract HttpRequestApi FromExpression(ValueExpression original);

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/src/Providers/Abstractions/ValueExpressionExtensions.cs

@@ -3,6 +3,7 @@
 
 using System;
 using Microsoft.Generator.CSharp.Expressions;
+using Microsoft.Generator.CSharp.Providers;
 using Microsoft.Generator.CSharp.Snippets;
 
 namespace Microsoft.Generator.CSharp.ClientModel.Providers
@@ -33,5 +34,55 @@ namespace Microsoft.Generator.CSharp.ClientModel.Providers
                     throw new InvalidOperationException($"Invalid type {typeof(T)}");
             }
         }
+
+        public static T ToApi<T>(this ParameterProvider valueExpression) where T : ScopedApi
+        {
+            switch (typeof(T).Name)
+            {
+                case nameof(ClientResponseApi):
+                    return (T)(object)ClientModelPlugin.Instance.TypeFactory.ClientResponseApi.FromExpression(valueExpression);
+                case nameof(HttpResponseApi):
+                    return (T)(object)ClientModelPlugin.Instance.TypeFactory.HttpResponseApi.FromExpression(valueExpression);
+                case nameof(HttpRequestOptionsApi):
+                    return (T)(object)ClientModelPlugin.Instance.TypeFactory.HttpRequestOptionsApi.FromExpression(valueExpression);
+                case nameof(HttpMessageApi):
+                    return (T)(object)ClientModelPlugin.Instance.TypeFactory.HttpMessageApi.FromExpression(valueExpression);
+                case nameof(HttpRequestApi):
+                    return (T)(object)ClientModelPlugin.Instance.TypeFactory.HttpRequestApi.FromExpression(valueExpression);
+                case nameof(ClientPipelineApi):
+                    return (T)(object)ClientModelPlugin.Instance.TypeFactory.ClientPipelineApi.FromExpression(valueExpression);
+                case nameof(StatusCodeClassifierApi):
+                    return (T)(object)ClientModelPlugin.Instance.TypeFactory.StatusCodeClassifierApi.FromExpression(valueExpression);
+                case nameof(RequestContentApi):
+                    return (T)(object)ClientModelPlugin.Instance.TypeFactory.RequestContentApi.FromExpression(valueExpression);
+                default:
+                    throw new InvalidOperationException($"Invalid type {typeof(T)}");
+            }
+        }
+
+        public static T ToApi<T>(this PropertyProvider valueExpression) where T : ScopedApi
+        {
+            switch (typeof(T).Name)
+            {
+                case nameof(ClientResponseApi):
+                    return (T)(object)ClientModelPlugin.Instance.TypeFactory.ClientResponseApi.FromExpression(valueExpression);
+                case nameof(HttpResponseApi):
+                    return (T)(object)ClientModelPlugin.Instance.TypeFactory.HttpResponseApi.FromExpression(valueExpression);
+                case nameof(HttpRequestOptionsApi):
+                    return (T)(object)ClientModelPlugin.Instance.TypeFactory.HttpRequestOptionsApi.FromExpression(valueExpression);
+                case nameof(HttpMessageApi):
+                    return (T)(object)ClientModelPlugin.Instance.TypeFactory.HttpMessageApi.FromExpression(valueExpression);
+                case nameof(HttpRequestApi):
+                    return (T)(object)ClientModelPlugin.Instance.TypeFactory.HttpRequestApi.FromExpression(valueExpression);
+                case nameof(ClientPipelineApi):
+                    return (T)(object)ClientModelPlugin.Instance.TypeFactory.ClientPipelineApi.FromExpression(valueExpression);
+                case nameof(StatusCodeClassifierApi):
+                    return (T)(object)ClientModelPlugin.Instance.TypeFactory.StatusCodeClassifierApi.FromExpression(valueExpression);
+                case nameof(RequestContentApi):
+                    return (T)(object)ClientModelPlugin.Instance.TypeFactory.RequestContentApi.FromExpression(valueExpression);
+                default:
+                    throw new InvalidOperationException($"Invalid type {typeof(T)}");
+            }
+        }
     }
 }

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/src/Providers/ClientPipelineExtensionsDefinition.cs

@@ -27,10 +27,10 @@ namespace Microsoft.Generator.CSharp.ClientModel.Providers
         {
             _pipelineParam = new ParameterProvider("pipeline", FormattableStringHelpers.Empty, ClientModelPlugin.Instance.TypeFactory.ClientPipelineApi.ClientPipelineType);
             _messageParam = new ParameterProvider("message", FormattableStringHelpers.Empty, ClientModelPlugin.Instance.TypeFactory.HttpMessageApi.HttpMessageType);
-            _requestOptionsParam = new ParameterProvider("options", FormattableStringHelpers.Empty, ClientModelPlugin.Instance.TypeFactory.HttpRequestOptionsApi.HttpRequestOptionsType);
-            _pipeline = _pipelineParam.AsExpression.ToApi<ClientPipelineApi>();
-            _message = _messageParam.AsExpression.ToApi<HttpMessageApi>();
-            _options = _requestOptionsParam.AsExpression.ToApi<HttpRequestOptionsApi>();
+            _requestOptionsParam = new ParameterProvider(ClientModelPlugin.Instance.TypeFactory.HttpRequestOptionsApi.ParameterName, FormattableStringHelpers.Empty, ClientModelPlugin.Instance.TypeFactory.HttpRequestOptionsApi.HttpRequestOptionsType);
+            _pipeline = _pipelineParam.ToApi<ClientPipelineApi>();
+            _message = _messageParam.ToApi<HttpMessageApi>();
+            _options = _requestOptionsParam.ToApi<HttpRequestOptionsApi>();
         }
 
         protected override TypeSignatureModifiers GetDeclarationModifiers()
@@ -124,7 +124,7 @@ namespace Microsoft.Generator.CSharp.ClientModel.Providers
             var clientErrorNoThrow = _options.NoThrow();
             return new MethodProvider(signature, new MethodBodyStatement[]
             {
-                _pipeline.Send(_message).Terminate(),
+                _pipeline.Send(_message, _options),
                 MethodBodyStatement.EmptyLine,
                 new IfStatement(_message.Response().IsError().And(new BinaryOperatorExpression("&", _options.NullConditional().Property("ErrorOptions"), clientErrorNoThrow).NotEqual(clientErrorNoThrow)))
                 {
@@ -167,7 +167,7 @@ namespace Microsoft.Generator.CSharp.ClientModel.Providers
             var clientErrorNoThrow = _options.NoThrow();
             return new MethodProvider(signature, new MethodBodyStatement[]
             {
-                _pipeline.SendAsync(_message).Terminate(),
+                _pipeline.SendAsync(_message, _options),
                 MethodBodyStatement.EmptyLine,
                 new IfStatement(_message.Response().IsError().And(new BinaryOperatorExpression("&", _options.NullConditional().Property("ErrorOptions"), clientErrorNoThrow).NotEqual(clientErrorNoThrow)))
                 {

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/src/Providers/ClientPipelineProvider.cs

@@ -4,6 +4,7 @@
 using System.ClientModel.Primitives;
 using Microsoft.Generator.CSharp.Expressions;
 using Microsoft.Generator.CSharp.Primitives;
+using Microsoft.Generator.CSharp.Statements;
 using static Microsoft.Generator.CSharp.Snippets.Snippet;
 
 namespace Microsoft.Generator.CSharp.ClientModel.Providers
@@ -26,11 +27,8 @@ namespace Microsoft.Generator.CSharp.ClientModel.Providers
         public override ValueExpression Create(ValueExpression options, ValueExpression perRetryPolicies)
             => Static<ClientPipeline>().Invoke(nameof(ClientPipeline.Create), [options, New.Array(ClientModelPlugin.Instance.TypeFactory.ClientPipelineApi.PipelinePolicyType), perRetryPolicies, New.Array(ClientModelPlugin.Instance.TypeFactory.ClientPipelineApi.PipelinePolicyType)]).As<ClientPipeline>();
 
-        public override HttpMessageApi CreateMessage()
-            => new PipelineMessageProvider(Original.Invoke(nameof(ClientPipeline.CreateMessage)));
-
         public override ValueExpression CreateMessage(HttpRequestOptionsApi requestOptions, ValueExpression responseClassifier)
-            => Original.Invoke(nameof(ClientPipeline.CreateMessage), requestOptions, responseClassifier).As<PipelineMessage>();
+            => new PipelineMessageProvider(Original.Invoke(nameof(ClientPipeline.CreateMessage)));
 
         public override ClientPipelineApi FromExpression(ValueExpression expression)
             => new ClientPipelineProvider(expression);
@@ -38,11 +36,11 @@ namespace Microsoft.Generator.CSharp.ClientModel.Providers
         public override ValueExpression PerRetryPolicy(params ValueExpression[] arguments)
             => Static<ApiKeyAuthenticationPolicy>().Invoke(nameof(ApiKeyAuthenticationPolicy.CreateHeaderApiKeyPolicy), arguments).As<ApiKeyAuthenticationPolicy>();
 
-        public override InvokeMethodExpression Send(HttpMessageApi message)
-            => Original.Invoke(nameof(ClientPipeline.Send), [message]);
+        public override MethodBodyStatement Send(HttpMessageApi message, HttpRequestOptionsApi options)
+            => Original.Invoke(nameof(ClientPipeline.Send), [message]).Terminate();
 
-        public override InvokeMethodExpression SendAsync(HttpMessageApi message)
-            => Original.Invoke(nameof(ClientPipeline.SendAsync), [message], true);
+        public override MethodBodyStatement SendAsync(HttpMessageApi message, HttpRequestOptionsApi options)
+            => Original.Invoke(nameof(ClientPipeline.SendAsync), [message], true).Terminate();
 
         public override ClientPipelineApi ToExpression() => this;
     }

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/src/Providers/PipelineMessageProvider.cs

@@ -2,6 +2,7 @@
 // Licensed under the MIT License.
 
 using System.ClientModel.Primitives;
+using Microsoft.CodeAnalysis.Classification;
 using Microsoft.Generator.CSharp.Expressions;
 using Microsoft.Generator.CSharp.Primitives;
 using Microsoft.Generator.CSharp.Statements;
@@ -27,10 +28,10 @@ namespace Microsoft.Generator.CSharp.ClientModel.Providers
         public override HttpResponseApi Response()
             => new PipelineResponseProvider(Original.Property(nameof(PipelineMessage.Response)));
 
-        public override ValueExpression ResponseClassifier()
-            => Original.Property(nameof(PipelineMessage.ResponseClassifier));
+        public override MethodBodyStatement ApplyResponseClassifier(StatusCodeClassifierApi statusCodeClassifier)
+            => Original.Property(nameof(PipelineMessage.ResponseClassifier)).Assign(statusCodeClassifier).Terminate();
 
-        public override MethodBodyStatement Apply(ValueExpression options)
+        public override MethodBodyStatement ApplyRequestOptions(HttpRequestOptionsApi options)
             => Original.Invoke(nameof(PipelineMessage.Apply), options).Terminate();
 
         public override MethodBodyStatement[] ExtractResponse()

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/src/Providers/PipelineRequestProvider.cs

@@ -6,6 +6,7 @@ using System.Collections.Generic;
 using Microsoft.Generator.CSharp.Expressions;
 using Microsoft.Generator.CSharp.ClientModel.Snippets;
 using static Microsoft.Generator.CSharp.Snippets.Snippet;
+using Microsoft.Generator.CSharp.Statements;
 
 namespace Microsoft.Generator.CSharp.ClientModel.Providers
 {
@@ -24,14 +25,14 @@ namespace Microsoft.Generator.CSharp.ClientModel.Providers
         public override HttpRequestApi FromExpression(ValueExpression original)
             => new PipelineRequestProvider(original);
 
-        public override InvokeMethodExpression SetHeaders(IReadOnlyList<ValueExpression> arguments)
-            => Original.Property(nameof(PipelineRequest.Headers)).Invoke(nameof(PipelineRequestHeaders.Set), arguments);
+        public override MethodBodyStatement SetHeaders(IReadOnlyList<ValueExpression> arguments)
+            => Original.Property(nameof(PipelineRequest.Headers)).Invoke(nameof(PipelineRequestHeaders.Set), arguments).Terminate();
 
-        public override AssignmentExpression SetMethod(string httpMethod)
-            => Original.Property(nameof(PipelineRequest.Method)).Assign(Literal(httpMethod));
+        public override MethodBodyStatement SetMethod(string httpMethod)
+            => Original.Property(nameof(PipelineRequest.Method)).Assign(Literal(httpMethod)).Terminate();
 
-        public override AssignmentExpression SetUri(ValueExpression value)
-            => Original.Property("Uri").Assign(value.As<ClientUriBuilderDefinition>().ToUri());
+        public override MethodBodyStatement SetUri(ValueExpression value)
+            => Original.Property("Uri").Assign(value.As<ClientUriBuilderDefinition>().ToUri()).Terminate();
 
         public override HttpRequestApi ToExpression() => this;
     }

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/src/Providers/RestClientProvider.cs

@@ -131,7 +131,7 @@ namespace Microsoft.Generator.CSharp.ClientModel.Providers
 
         private MethodProvider BuildCreateRequestMethod(InputOperation operation)
         {
-            var pipelineField = ((MemberExpression)ClientProvider.PipelineProperty).ToApi<ClientPipelineApi>();
+            var pipelineField = ClientProvider.PipelineProperty.ToApi<ClientPipelineApi>();
 
             var options = ScmKnownParameters.RequestOptions;
             var signature = new MethodSignature(
@@ -165,18 +165,18 @@ namespace Microsoft.Generator.CSharp.ClientModel.Providers
                 signature,
                 new MethodBodyStatements(
                 [
-                    Declare("message", pipelineField.CreateMessage().ToApi<HttpMessageApi>(), out HttpMessageApi message),
-                    message.ResponseClassifier().Assign(classifier).Terminate(),
-                    Declare("request", message.Request().ToApi<HttpRequestApi>(), out HttpRequestApi request), // ScopedApi<PipelineRequest>
-                    request.SetMethod(operation.HttpMethod).Terminate(),
+                    Declare("message", pipelineField.CreateMessage(options.ToApi<HttpRequestOptionsApi>(), classifier).ToApi<HttpMessageApi>(), out HttpMessageApi message),
+                    message.ApplyResponseClassifier(classifier.ToApi<StatusCodeClassifierApi>()),
+                    Declare("request", message.Request().ToApi<HttpRequestApi>(), out HttpRequestApi request),
+                    request.SetMethod(operation.HttpMethod),
                     Declare("uri", New.Instance<ClientUriBuilderDefinition>(), out ScopedApi<ClientUriBuilderDefinition> uri),
                     uri.Reset(ClientProvider.EndpointField).Terminate(),
                     .. AppendPathParameters(uri, operation, paramMap),
                     .. AppendQueryParameters(uri, operation, paramMap),
-                    request.SetUri(uri).Terminate(),
+                    request.SetUri(uri),
                     .. AppendHeaderParameters(request, operation, paramMap),
                     .. GetSetContent(request, signature.Parameters),
-                    message.Apply(options),
+                    message.ApplyRequestOptions(options.ToApi<HttpRequestOptionsApi>()),
                     Return(message)
                 ]),
                 this);
@@ -231,7 +231,7 @@ namespace Microsoft.Generator.CSharp.ClientModel.Providers
                 }
                 else
                 {
-                    statement = request.SetHeaders([Literal(inputParameter.NameInRequest), toStringExpression.As<string>()]).Terminate();
+                    statement = request.SetHeaders([Literal(inputParameter.NameInRequest), toStringExpression.As<string>()]);
                 }
                 statements.Add(statement);
             }

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/test/Providers/Abstractions/ClientPipelineApiTests.cs

@@ -2,6 +2,7 @@ using System.Linq;
 using Microsoft.Generator.CSharp.ClientModel.Providers;
 using Microsoft.Generator.CSharp.Expressions;
 using Microsoft.Generator.CSharp.Primitives;
+using Microsoft.Generator.CSharp.Statements;
 using Microsoft.Generator.CSharp.Tests.Common;
 using NUnit.Framework;
 
@@ -28,7 +29,6 @@ namespace Microsoft.Generator.CSharp.ClientModel.Tests.Providers.Abstractions
 
             Assert.NotNull(method);
             Assert.NotNull(method!.BodyStatements);
-            var test = method?.BodyStatements?.ToDisplayString();
             Assert.AreEqual(Helpers.GetExpectedFromFile(), method!.BodyStatements!.ToDisplayString());
         }
 
@@ -58,9 +58,6 @@ namespace Microsoft.Generator.CSharp.ClientModel.Tests.Providers.Abstractions
             public override ValueExpression Create(ValueExpression options, ValueExpression perRetryPolicies)
                 => Original.Invoke("GetFakeCreate", [options, perRetryPolicies]);
 
-            public override HttpMessageApi CreateMessage()
-                => Original.Invoke("GetFakeCreateMessage").ToApi<HttpMessageApi>();
-
             public override ValueExpression CreateMessage(HttpRequestOptionsApi requestOptions, ValueExpression responseClassifier)
                 => Original.Invoke("GetFakeCreateMessage", [requestOptions, responseClassifier]);
 
@@ -70,11 +67,11 @@ namespace Microsoft.Generator.CSharp.ClientModel.Tests.Providers.Abstractions
             public override ValueExpression PerRetryPolicy(params ValueExpression[] arguments)
                 => Original.Invoke("GetFakePerRetryPolicy", arguments);
 
-            public override InvokeMethodExpression Send(HttpMessageApi message)
-                => Original.Invoke("GetFakeSend", message);
+            public override MethodBodyStatement Send(HttpMessageApi message, HttpRequestOptionsApi options)
+                => Original.Invoke("GetFakeSend", [message, options]).Terminate();
 
-            public override InvokeMethodExpression SendAsync(HttpMessageApi message)
-                => Original.Invoke("GetFakeSendAsync", message);
+            public override MethodBodyStatement SendAsync(HttpMessageApi message, HttpRequestOptionsApi options)
+                => Original.Invoke("GetFakeSendAsync", [message, options]).Terminate();
 
             public override ClientPipelineApi ToExpression() => this;
         }

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/test/Providers/Abstractions/HttpMessageApiTests.cs

@@ -32,7 +32,6 @@ namespace Microsoft.Generator.CSharp.ClientModel.Tests.Providers.Abstractions
 
             Assert.IsNotNull(method);
             Assert.IsNotNull(method!.BodyStatements);
-            var test = method!.BodyStatements!.ToDisplayString();
             Assert.AreEqual(Helpers.GetExpectedFromFile(), method!.BodyStatements!.ToDisplayString());
         }
 
@@ -55,8 +54,8 @@ namespace Microsoft.Generator.CSharp.ClientModel.Tests.Providers.Abstractions
 
             public override CSharpType HttpMessageType => typeof(string);
 
-            public override MethodBodyStatement Apply(ValueExpression options)
-                => Original.Invoke("GetFakeApply", [options]).Terminate();
+            public override MethodBodyStatement ApplyRequestOptions(HttpRequestOptionsApi options)
+                => Original.Invoke("GetFakeSetRequestContext", [options]).Terminate();
 
             public override ValueExpression BufferResponse()
                 => Original.Invoke("GetFakeBufferResponse");
@@ -73,8 +72,8 @@ namespace Microsoft.Generator.CSharp.ClientModel.Tests.Providers.Abstractions
             public override HttpResponseApi Response()
                 => Original.Invoke("GetFakeResponse").ToApi<HttpResponseApi>();
 
-            public override ValueExpression ResponseClassifier()
-                => Original.Invoke("GetFakeResponseClassifier");
+            public override MethodBodyStatement ApplyResponseClassifier(StatusCodeClassifierApi statusCodeClassifier)
+                => Original.Invoke("GetFakeAssignResponseClassifier", [statusCodeClassifier]).Terminate();
 
             public override HttpMessageApi ToExpression() => this;
         }

packages/http-client-csharp/generator/Microsoft.Generator.CSharp.ClientModel/test/Providers/Abstractions/TestData/ClientPipelineApiTests/ValidateBodyOfRestClientOperationIsOverridden.cs

@@ -1,4 +1,4 @@
-global::System.ClientModel.Primitives.PipelineMessage message = Pipeline.GetFakeCreateMessage();
+global::System.ClientModel.Primitives.PipelineMessage message = Pipeline.GetFakeCreateMessage(options, PipelineMessageClassifier200);
 message.ResponseClassifier = PipelineMessageClassifier200;
 global::System.ClientModel.Primitives.PipelineRequest request = message.Request;
 request.Method = "GET";