System.Text.DecoderFallbackException: Unable to translate bytes [D6] at index 286 from specified code page to Unicode.

Using the API, I have written a file to a SharePoint app inside of a folder. Then I make a call to update it with some metadata. The body of the request has some Unicode characters but I get an error returned (e.g. "Örebro—Kyrkoböcker").  What do I need to add to the request to communicate to SharePoint to allow Unicode characters in the body of the request?  Is this even allowed?

POST https://sites-test.ldschurch.org/sites/worldservertest1/_api/Web/Lists(guid'7787c88e-7301-4ada-84fa-d30b5a808109')/Items(2363) HTTP/1.1

Content-Type: application/json;odata=verbose

Accept: application/json;odata=verbose

IF-MATCH: *

X-HTTP-Method: MERGE

X-RequestDigest: 0x2E75F594DAC1EF31D79C19C1B562DD843C31353FBE69D0277A7906233E91073670989CEE40E7A261CA50C22D326A48CF71FE0A42E42C451909CB88B23D5E8CB2,04 Nov 2014 16:38:03 -0000

Content-Length: 373

Host: sites-test.ldschurch.org

Connection: Keep-Alive

User-Agent: Apache-HttpClient/4.3.4 (java 1.5)

Accept-Encoding: gzip,deflate

Authorization: NTLM TlRMTVNTUAADAAAAGAAYAEgAAADCAMIAYAAAAAYABgAiAQAADgAOACgBAAAAAAAANgEAAAAAAAA2AQAABYKIogUBKAoAAAAPkV0IHOkgeQOPcWIw3qcycdNgiKw1hpRV6XYmDu/rTDAR1dY0uSgFQQEBAAAAAAAAgLANtE34zwEVd05kFeC/qAAAAAACAAYATABEAFMAAQAMAFcAMQAyADYANQA2AAQAGgBsAGQAcwBjAGgAdQByAGMAaAAuAG8AcgBnAAMAKABXADEAMgA2ADUANgAuAGwAZABzAGMAaAB1AHIAYwBoAC4AbwByAGcABQAaAGwAZABzAGMAaAB1AHIAYwBoAC4AbwByAGcABwAIAFirIbRN+M8BAAAAAAAAAABMAEQAUwBmAHIAaQB0AGMAaABkAA==

{ '__metadata': { 'type': 'SP.Data.SourceItem' } , 'productNumber': 'PD10050912', 'wsLanguage': '000_English', 'projectID': 'C89', 'fileType': 'Scope', 'productComponent': '', 'englishApprovalDate': '2/01/2014', 'wsStatus': '', 'translatedFrom': '000_English', 'productName': 'Sverige, []rebro?Kyrkob[]cker', 'projectName': 'Sverige, []rebro?Kyrkob[]cker', 'fileNamePath': '' }

I get this response:

HTTP/1.1 500 Internal Server Error

Cache-Control: private, max-age=0

Transfer-Encoding: chunked

Content-Type: application/json;odata=verbose;charset=utf-8

Expires: Mon, 20 Oct 2014 15:38:03 GMT

Last-Modified: Tue, 04 Nov 2014 16:38:03 GMT

Server: Microsoft-IIS/7.5

X-SharePointHealthScore: 0

SPClientServiceRequestDuration: 145

X-AspNet-Version: 4.0.30319

SPRequestGuid: 87ddc89c-ae01-80f2-a96f-787c03a7c543

request-id: 87ddc89c-ae01-80f2-a96f-787c03a7c543

X-RequestDigest: 0x2E75F594DAC1EF31D79C19C1B562DD843C31353FBE69D0277A7906233E91073670989CEE40E7A261CA50C22D326A48CF71FE0A42E42C451909CB88B23D5E8CB2,04 Nov 2014 16:38:03 -0000

X-FRAME-OPTIONS: SAMEORIGIN

Persistent-Auth: true

X-Powered-By: ASP.NET

MicrosoftSharePointTeamServices: 15.0.0.4569

X-Content-Type-Options: nosniff

X-MS-InvokeApp: 1; RequireReadOnly

Date: Tue, 04 Nov 2014 16:38:03 GMT

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{"error":{"code":"-1, System.Text.DecoderFallbackException","message":{"lang":"en-US","value":"Unable to translate bytes [D6] at index 286 from specified code page to Unicode."}}}

0

When I remove the Unicode characters from the request it responds with a 204.