Flat HTTP Payload with HTTP Receiver

Question

Hello,
I have the requirement to send a flat structure (no XML) within the Payload of an HTTP POST. The flat structure should be URL-encoded. I already have a combined XSLT/Java Mapping which creates and encodes the desired structure.
Problem now is that an XML-prolog is added to the message after the mapping step. The rest of the message looks fine, just the prolog cannot be handled of course.
Is there any way having the XML prolog removed in a simple way? I want to avoid having the URL encoding logic in a module as I  use some parameters in the already existing Java Mapping and the mapping is already working fine.
Thank you!

Answer 1

Hi Guppenberger,
I understand after mapping step XML prolog <?xml version="1.0" encoding="UTF-8" standalone="yes" ?> is getting added to non XML payload. Now, you want to delete it from payload. Please consider below solution as last resort.
As payload is not XML, graphical and XSLT mapping cannot be used. So to remove prolog, you need to implement below Java Mapping as last mapping in Operational Mapping.
package com.prolog;
import com.sap.aii.mapping.api.*;
import java.io.*;
public class RemoveProlog_JavaMapping extends AbstractTransformation {
    public void transform(TransformationInput transformationInput, TransformationOutput transformationOutput) throws StreamTransformationException {
        OutputStream outputstream = null;
        try {
            //Read input payload and write the same to output payload after "?>" .
            //Beacuse <?xml version="1.0" encoding="UTF-8" standalone="yes" ?> ends with "?>"
            InputStream inputstream = transformationInput.getInputPayload().getInputStream();
            outputstream = transformationOutput.getOutputPayload().getOutputStream();
            byte[] b = new byte[inputstream.available()];
            inputstream.read(b);
            String inputFileContent = new String(b);
            outputstream.write(inputFileContent.substring(inputFileContent.indexOf("?>")+2).getBytes());
        } catch (Exception exception) {
            exception.printStackTrace();
Regards,
Raghu_Vamsee