public String getContentType() {
        return contentType;
    }
Returns the content type response header override if it has been
specified, or null otherwise.

@return Returns the content type response header override if it has been
        specified, or null otherwise.
@see ResponseHeaderOverrides#RESPONSE_HEADER_CONTENT_TYPE
aws-java-sdk-s3/src/main/java/com/amazonaws/services/s3/model/ResponseHeaderOverrides.java