Add DownstreamHttpMethodCreatorMiddleware

src/Ocelot/Configuration/Builder/DownstreamReRouteBuilder.cs

@@ -41,6 +41,7 @@ namespace Ocelot.Configuration.Builder
         private List<AddHeader> _addHeadersToUpstream;
         private bool _dangerousAcceptAnyServerCertificateValidator;
         private SecurityOptions _securityOptions;
+        private string _downstreamHttpMethod;
 
         public DownstreamReRouteBuilder()
         {
@@ -56,6 +57,12 @@ namespace Ocelot.Configuration.Builder
             return this;
         }
 
+        public DownstreamReRouteBuilder WithDownStreamHttpMethod(string method)
+        {
+            _downstreamHttpMethod = method;
+            return this;
+        }
+
         public DownstreamReRouteBuilder WithLoadBalancerOptions(LoadBalancerOptions loadBalancerOptions)
         {
             _loadBalancerOptions = loadBalancerOptions;
@@ -282,7 +289,8 @@ namespace Ocelot.Configuration.Builder
                 _addHeadersToDownstream,
                 _addHeadersToUpstream,
                 _dangerousAcceptAnyServerCertificateValidator,
-                _securityOptions);
+                _securityOptions,
+                _downstreamHttpMethod);
         }
     }
 }

src/Ocelot/Configuration/Creator/ReRoutesCreator.cs

@@ -138,6 +138,7 @@ namespace Ocelot.Configuration.Creator
                 .WithAddHeadersToUpstream(hAndRs.AddHeadersToUpstream)
                 .WithDangerousAcceptAnyServerCertificateValidator(fileReRoute.DangerousAcceptAnyServerCertificateValidator)
                 .WithSecurityOptions(securityOptions)
+                .WithDownStreamHttpMethod(fileReRoute.DownstreamHttpMethod)
                 .Build();
 
             return reRoute;

src/Ocelot/Configuration/DownstreamReRoute.cs

@@ -38,7 +38,8 @@ namespace Ocelot.Configuration
             List<AddHeader> addHeadersToDownstream,
             List<AddHeader> addHeadersToUpstream,
             bool dangerousAcceptAnyServerCertificateValidator,
-            SecurityOptions securityOptions)
+            SecurityOptions securityOptions,
+            string downstreamHttpMethod)
         {
             DangerousAcceptAnyServerCertificateValidator = dangerousAcceptAnyServerCertificateValidator;
             AddHeadersToDownstream = addHeadersToDownstream;
@@ -72,6 +73,7 @@ namespace Ocelot.Configuration
             LoadBalancerKey = loadBalancerKey;
             AddHeadersToUpstream = addHeadersToUpstream;
             SecurityOptions = securityOptions;
+            DownstreamHttpMethod = downstreamHttpMethod;
         }
 
         public string Key { get; }
@@ -106,5 +108,6 @@ namespace Ocelot.Configuration
         public List<AddHeader> AddHeadersToUpstream { get; }
         public bool DangerousAcceptAnyServerCertificateValidator { get; }
         public SecurityOptions SecurityOptions { get; }
+        public string DownstreamHttpMethod { get; }
     }
 }

src/Ocelot/Configuration/File/FileReRoute.cs

@@ -29,6 +29,7 @@ namespace Ocelot.Configuration.File
         public string DownstreamPathTemplate { get; set; }
         public string UpstreamPathTemplate { get; set; }
         public List<string> UpstreamHttpMethod { get; set; }
+        public string DownstreamHttpMethod { get; set; }
         public Dictionary<string, string> AddHeadersToRequest { get; set; }
         public Dictionary<string, string> UpstreamHeaderTransform { get; set; }
         public Dictionary<string, string> DownstreamHeaderTransform { get; set; }

src/Ocelot/DownstreamUrlCreator/Middleware/DownstreamHttpMethodCreatorMiddleware.cs

@@ -0,0 +1,27 @@
+using Ocelot.Logging;
+using Ocelot.Middleware;
+using System.Threading.Tasks;
+
+namespace Ocelot.DownstreamUrlCreator.Middleware
+{
+    public class DownstreamHttpMethodCreatorMiddleware : OcelotMiddleware
+    {
+        private readonly OcelotRequestDelegate _next;
+
+        public DownstreamHttpMethodCreatorMiddleware(OcelotRequestDelegate next, IOcelotLoggerFactory loggerFactory)
+            : base(loggerFactory.CreateLogger<DownstreamHttpMethodCreatorMiddleware>())
+        {
+            _next = next;
+        }
+
+        public async Task Invoke(DownstreamContext context)
+        {
+            if (context.DownstreamReRoute.DownstreamHttpMethod != null)
+            {
+                context.DownstreamRequest.Method = context.DownstreamReRoute.DownstreamHttpMethod;
+            }
+
+            await _next.Invoke(context);
+        }
+    }
+}

src/Ocelot/Request/Middleware/DownstreamRequest.cs

@@ -24,7 +24,7 @@ namespace Ocelot.Request.Middleware
 
         public HttpRequestHeaders Headers { get; }
 
-        public string Method { get; }
+        public string Method { get; set; }
 
         public string OriginalString { get; }
 
@@ -52,6 +52,8 @@ namespace Ocelot.Request.Middleware
             };
 
             _request.RequestUri = uriBuilder.Uri;
+            _request.Method = new HttpMethod(Method);
+            _request.Content = Content;
             return _request;
         }
 

src/Ocelot/Request/Middleware/HttpRequestBuilderMiddlewareExtensions.cs

@@ -1,4 +1,5 @@
 using Microsoft.AspNetCore.Builder;
+using Ocelot.DownstreamUrlCreator.Middleware;
 using Ocelot.Middleware.Pipeline;
 
 namespace Ocelot.Request.Middleware
@@ -7,7 +8,8 @@ namespace Ocelot.Request.Middleware
     {
         public static IOcelotPipelineBuilder UseDownstreamRequestInitialiser(this IOcelotPipelineBuilder builder)
         {
-            return builder.UseMiddleware<DownstreamRequestInitialiserMiddleware>();
+            return builder.UseMiddleware<DownstreamRequestInitialiserMiddleware>()
+                .UseMiddleware<DownstreamHttpMethodCreatorMiddleware>();
         }
     }
 }