I installed both swish-e2.2.3 and 2.4.2 and get the following (this is from
2.4.2):
Indexing Data Source: "External-Program"
Indexing "./spider.pl"
External Program found: ./spider.pl
http://www.myjewishlearning.com/spider.html - Using HTML2 parser -  (11565
words)

Warning: Unknown header line: 'elim/TraditionalFarewell.htm'>Traditional
Farewells</a><br>' from program ./spider.pl
http://www.myjewishlearning.com/texts/about_jewish_texts/Primer_AboutTexts_E
dit_20.htm - Using HTML2 parser -  (531 words)

Warning: Unknown header line: '>' from program ./spider.pl

Warning: Unknown header line: '</body>' from program ./spider.pl

Warning: Unknown header line: '</html>' from program ./spider.pl
http://www.myjewishlearning.com/texts/about_jewish_texts/TO_About_Contents30
htm - Using HTML2 parser -  (786 words)
http://www.myjewishlearning.com/texts/about_jewish_texts/TO_Debates270.htm
- Using HTML2 parser -  (725 words)

Warning: Unknown header line: 'html>' from program ./spider.pl
http://www.myjewishlearning.com/texts/bible/Primer_Bible520.htm - Using
HTML2 parser -  (594 words)

Warning: Unknown header line: 'y>' from program ./spider.pl

Warning: Unknown header line: '</html>' from program ./spider.pl
http://www.myjewishlearning.com/texts/bible/TO_aboutbible_530.htm - Using
HTML2 parser -  (849 words)
err: External program failed to return required headers Path-Name:
.