Oracle Fusion Middleware web services enable you to pass large attachments as a stream. Unlike the JAX-RPC API, which treats attachments as if they are entirely in memory, streams make the programming model more efficient to use. Streams also enhance performance and scalability because there is no need to load the attachment into memory before service execution.

As with embedded attachments, streamed attachments conform to the multipart MIME binary format. Embedded attachments refer to inlined/encoded attachments.

On the wire, messages with streamed attachments are identical to any other SOAP message with attachments.

The following example provides a sample message with a streamed attachment. The first part in the message is the SOAP envelope (<SOAP-ENV:Envelope...). The second part is the attachment (for this example, myImage.gif).

MIME-Version: 1.0
Content-Type: Multipart/Related; boundary=MIME_boundary; type=text/xml;
Content-Description: This is the optional message description.

--MIME_boundary
Content-Type: text/xml; charset=UTF-8
Content-Transfer-Encoding: 8bit
Content-ID: NotSure/DoesntMatter

<?xml version='1.0' ?>
<SOAP-ENV:Envelope
xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
<SOAP-ENV:Body>
. . .
<DocumentName>MyImage.gif</DocumentName>
. . .
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>

--MIME_boundary
Content-Type: image/gif
Content-Transfer-Encoding: binary
Content-ID: AnythingYoudLike

...binary GIF image...
--MIME_boundary--