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I have a simple WCF REST method that will return an image/file/etc in a byte array: [OperationContract] [WebGet(UriTemplate = "TestMethod")] byte[] TestMethod(); The service contract is bound to a webHttpBinding with the following behavior: <endpointBehaviors> <behavior name="webHttpBehavior"> <webHttp defaultOutgoingResponseFormat="Json" /> </behavior> </endpointBehaviors> The method works fine, except the byte array is formatted like: [25,15,23,64,6,5,2,33,12,124,221,42,15,64,142,78,3,23] If I remove the attribute defaultOutgoingResponseFormat="Json" , the service defaults to XML formatting, and the result is encoded in Base64 like: GQ8XQAYFAiEMfN0qD0COTgMX which saves on data transfer, especially when the data get large. How can I enable Base64 encoding for the JSON output format?
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