dgate | A command-line interface for DeployGate | Command Line Interface library

Your CGI module generates raw HTTP response that should be transmitted as-is by your IW content handler. The response message consists of:

1. Status line
2. HTTP header lines
3. An empty line separating headers and body
4. Body (actual image data in your case)

IntraWeb's THTTPReply doesn't seem to give you control over raw HTTP response. It provides dedicated interface to separately manipulate with status, headers and body. That's why you need to pre-process the stream returned from CGI and split headers apart from body by the empty line. Then you can transmit them via THTTPReply. Maybe you'd also like to whitelist only some headers and ignore the rest.

In your code snippet you use ReadStringFromStream which is pointless, because you discard the returned value anyway. It moves the position of Stream to the end of the stream, but that doesn't matter, because aReply.SendStream(Stream) sends the whole stream content from the beginning.

Another point is that you use IndyTextEncoding_OSDefault as the last parameter to ReadStringFromStream, which is probably wrong, because HTTP header is encoded in ASCII and therefore you should use IndyTextEncoding_ASCII.

Try this code instead: