When you run the script from the command line, how long does it take before the output is seen ?

You can use a command like:

time perl <script-name>
[download]

to get overall execution time.

The message:
70007)The timeout specified has expired
seems to indicate that the apache web server timed-out waiting for the output to be produced.

You could try to set the Timeout directive in httpd.conf, to something like 300 seconds (5 minutes).

See https://httpd.apache.org/docs/2.4/mod/core.html#timeout.

TimeOut Directive Description: Amount of time the server will wait for certain events before failing a request
Syntax: TimeOut seconds
Default: TimeOut 60
Context: server config, virtual host
Status: Core
Module: core
The TimeOut directive defines the length of time Apache httpd will wait for I/O in various circumstances:

When reading data from the client, the length of time to wait for a TCP packet to arrive if the read buffer is empty.
For initial data on a new connection, this directive doesn't take effect until after any configured AcceptFilter has passed the new connection to the server.