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    <p>The problem is in the url of the inner request. The url needs to be relative to the host. Let's say your service is hosted in <code>host/service</code> (in our case, service will be the equivalent as the odata prefix), so normally you send requests like <code>host/service/Customers</code> or <code>/service/Customers</code>. </p> <p>When you issue a batch request, the urls in the inner requests might be absolute or relative to the host. The problem is that in your request, the url is <code>ServiceMetadatas</code> which is relative to the service root, not the host.</p> <p>Web API is interpreting the relative url as <code>host/ServiceMetadatas</code> instead of as <code>host/service/ServiceMetadatas</code> and that's what causes the error.</p> <p>Based on your repro project, the following request works fine:</p> <pre><code>POST http://localhost:6974/odata/$batch HTTP/1.1 Host: localhost:6974 User-Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; rv:23.0) Gecko/20100101 Firefox/23.0 Accept: multipart/mixed Accept-Language: he-IL,he;q=0.8,en-US;q=0.5,en;q=0.3 Accept-Encoding: gzip, deflate DataServiceVersion: 2.0 Content-Type: multipart/mixed; charset=UTF-8;boundary=batch_4f09-d7cf-dd99 MaxDataServiceVersion: 2.0 Referer: http://localhost:9000/ Content-Length: 565 Origin: http://localhost:9000 Connection: keep-alive Pragma: no-cache Cache-Control: no-cache --batch_4f09-d7cf-dd99 Content-Type: multipart/mixed; boundary=changeset_ca0c-06b7-ddbe --changeset_ca0c-06b7-ddbe Content-Type: application/http Content-Transfer-Encoding: binary POST odata/ServiceMetadatas HTTP/1.1 Content-ID: 1 DataServiceVersion: 2.0 Accept: application/atomsvc+xml;q=0.8, application/json;odata=verbose;q=0.5, */*;q=0.1 Content-Type: application/json;odata=verbose MaxDataServiceVersion: 2.0 {"ServiceMetadataId":-1,"ServiceName":"sdf sdf","Description":"sd fgs df"} --changeset_ca0c-06b7-ddbe-- --batch_4f09-d7cf-dd99-- </code></pre> <p>The associated response is the following one:</p> <pre><code>HTTP/1.1 202 Accepted Cache-Control: no-cache Pragma: no-cache Content-Type: multipart/mixed; boundary=batchresponse_6779b5e5-6e40-4363-9a98-5a33d062da28 Expires: -1 Server: Microsoft-IIS/8.0 DataServiceVersion: 2.0 X-AspNet-Version: 4.0.30319 X-SourceFiles: =?UTF-8?B?QzpcVXNlcnNcamFjYWx2YXJcRG93bmxvYWRzXE9EYXRhQmF0Y2gtbWFzdGVyXENsZWFuV2ViQXBpUHJvamVjdFxvZGF0YVwkYmF0Y2g=?= X-Powered-By: ASP.NET Date: Tue, 17 Sep 2013 16:48:50 GMT Content-Length: 872 --batchresponse_6779b5e5-6e40-4363-9a98-5a33d062da28 Content-Type: multipart/mixed; boundary=changesetresponse_b63ca946-ce66-43e6-a78f-d44a5b8f2d5c --changesetresponse_b63ca946-ce66-43e6-a78f-d44a5b8f2d5c Content-Type: application/http Content-Transfer-Encoding: binary HTTP/1.1 201 Created Location: http://localhost:6974/odata/ServiceMetadatas(-1) Content-ID: 1 Content-Type: application/json; odata=verbose; charset=utf-8 DataServiceVersion: 2.0 { "d":{ "__metadata":{ "id":"http://localhost:6974/odata/ServiceMetadatas(-1)","uri":"http://localhost:6974/odata/ServiceMetadatas(-1)","type":"CleanWebApiProject.Models.ServiceMetadata" },"ServiceMetadataId":-1,"ServiceName":"sdf sdf","Description":"sd fgs df" } } --changesetresponse_b63ca946-ce66-43e6-a78f-d44a5b8f2d5c-- --batchresponse_6779b5e5-6e40-4363-9a98-5a33d062da28-- </code></pre> <p>The only change that I made in the controller is the following (and not related to batch):</p> <pre><code>public class ServiceMetadatasController : EntitySetController&lt;ServiceMetadata, int&gt; { protected override ServiceMetadata CreateEntity(ServiceMetadata entity) { return entity; } protected override int GetKey(ServiceMetadata entity) { return entity.ServiceMetadataId; } public override IQueryable&lt;ServiceMetadata&gt; Get() { return new List&lt;ServiceMetadata&gt; { new ServiceMetadata() {ServiceName = "Service1", Description = "Desc1"}, new ServiceMetadata() {ServiceName = "Service2", Description = "Desc1"} }.AsQueryable(); } } </code></pre> <p>I hope this solves your problem, also let me know if you are generating the url for the inner request manually or if it's breezejs doing it for you, so that I can follow up and make sure it gets fixed.</p>
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    1. COThat is right on the money!! Excellent! I still have to make Breeze using it, I hope to make it work soon.
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