Does WCF MTOM Support only Binary

Question

We have a WCF service which accepts MTOM encoded messages. It seems like WCF only supports attachments which use binary for the "Content-Transfer-Encoding". For example, if posting a message using 8bit this is what is returned:
Content-Transfer-Encoding '8bit' not supported for binary part. Must be 'binary'.
If this expected? Is there some configuration to change to accept all the valid MIME encoding formats?

Answer 1

Hi Joe Athman,
>>Content-Transfer-Encoding '8bit' not supported for binary part. Must be 'binary'.If this expected?
Yes, MTOM is a mechanism for transmitting large binary attachments with SOAP messages as raw bytes, allowing for smaller messages.
For more information, please try to refer to the following article:
#MTOM Encoding:
https://msdn.microsoft.com/en-us/library/aa395209(v=vs.110).aspx .
>> Is there some configuration to change to accept all the valid MIME encoding formats?
I will recommend you use the Custom Message Encoder, after that we can let it to accept the supported encoding formats which you want. For more information, please try to refer to the following articles:
#Using MTOM in a WCF custom encoder：
http://blogs.msdn.com/b/carlosfigueira/archive/2011/02/16/using-mtom-in-a-wcf-custom-encoder.aspx .
#WCF Extensibility – Message Encoders：
http://blogs.msdn.com/b/carlosfigueira/archive/2011/11/09/wcf-extensibility-message-encoders.aspx .
#Custom Encoders：
https://msdn.microsoft.com/en-us/library/vstudio/ms735115(v=vs.100).aspx .
Best Regards,
Amy Peng
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