Is there a way to send an Http Post with an atachment to a restful web service?.

I have done this to upload files to Sharepoint using the Send HTTP Request Plug-in and passing the document converted to base 64 in the body of the request (forum.appian.com/.../summary)

Eduardo,
I get a 415 back. I created a smart service which works but would prefer the built in method. I am passing the content type in the header as application/octet-stream. Can you please give me your header values.

In my case I am making a Web Service call using the plug-in therefore I'm passing a string which contains the SOAP envelope and one of the fields (Stream) in the envelope is the content of the file. That said, since I'm sending a SOAP envelope my headers are:

="Content-Type"
="application/soap+xml; charset=utf-8"

and my SOAP envelope looks like this

<soap:Envelope xmlns:soap='www.w3.org/.../soap-envelope' xmlns:soap1='schemas.microsoft.com/.../'>
<soap:Header/>
<soap:Body>
<soap1:CopyIntoItems>
<soap1:SourceUrl>Default</soap1:SourceUrl>
<soap1:DestinationUrls>
<soap1:string>xxxx.xxxxx.net/.../soap1:string>
</soap1:DestinationUrls>
<soap1:Fields>
<soap1:FieldInformation Type='Text' DisplayName='xxxxxx' InternalName='xxxxx' Id='22222222-2222-2222-2222-222222222222' Value='xxxxx'/>
</soap1:Fields>
<soap1:Stream>dGhpcyBpcyBhIHRleHQgZmlsZQ==</soap1:Stream>
</soap1:CopyIntoItems>
</soap:Body>
</soap:Envelope>

In my case, it is a restful service. works fine with org.apache.http.client.HttpClient

Do you think a custom smart service would be ok for this scenario.

If you already have a custom smart service working then it's fine to keep using it. You can eventually switch to the out of the box HTTP Query once it has additional features that your plug-in doesn't support (e.g. NTLM support, etc)

Can I turn on debug to check the values passed. Dont know why its returning a 415

What node are you using? the Send HTTP Request or HTTP Query? They both have the same icon but one is a plug-in the other is OOB since 7.7

i am using Send HTTP Request. we have 7.5 installed

To enable DEBUG mode you can add this to runtime_ear\\suite.ear\\resources\\appian_log4j.properties

log4j.logger.com.appiancorp.process.runtime.activities=DEBUG