code: protected byte[] getBoundary(String contentType) {
  		ParameterParser parser = new ParameterParser();
  		parser.setLowerCaseNames(true);
  		// Parameter parser can handle null input
  		Map<String,String> params = parser.parse(contentType, new char[] {';', ','});
  		String boundaryStr = (String) params.get("boundary");
  
  		if (boundaryStr == null) {
  			return null;
  		}
  
  		byte[] boundary;
  		try {
  			boundary = boundaryStr.getBytes("ISO-8859-1");
  		} catch (UnsupportedEncodingException e) {
  			boundary = boundaryStr.getBytes();
  		}
  		return boundary;
  	}
docs: Retrieves the boundary that is used to separate the request parts from the Content-Type header.
  
  @param contentType the value of the Content-Type header.
  
  @return a byte array with the boundary.