7.5 Exercises
Exercise 7.1
Use your web browser to examine the actual HTML code for some of your
favorite web pages. For example, on my Netscape browser, once a page
is displayed, I can select the menu options View and then Page Source
to see the HTML code.
Exercise 7.2
Identify the web server that is running on your computer. What
version of the software is installed? Find the documentation for that
web server. Are there good books available for that web server; free
online tutorials, newsgroups, or FAQs; or local experts? Locate and
examine the various logs for your web server. Where are the
configuration files? How do you stop the web server, change a
configuration file, and start the web server again? Is it a good idea
to make a copy of a working configuration file before you change it?
Exercise 7.3
Is your computer located behind a firewall or a proxy server?
Exercise 7.4
Get the URL::URI module and read the documentation.
Exercise 7.5
Read the CGI module documentation. If available, look at a book about
Perl and CGI.
Exercise 7.6
The sequence file uploaded by the CGI Perl script
webrebase1 is assumed to be in FASTA format.
Rewrite the program so that it uses the
SeqFileIO.pm module and reports a problem back to
the web page if that module can't determine the
sequence file format.
Exercise 7.7
Write a new version of the CGI script webrebase1
that uses the RestrictDB.pm module instead of the
Restrict.pm module; it will use a relational
database store of Rebase information instead of a DBM hash-based
store. Note that your DBMS will have to allow the web server to
access its Rebase tables; this may occur as the user
nobody or some other. Getting the permissions
right is probably the hardest part of this exercise and is very much
dependant on your operating system and web-server software.
Exercise 7.8
Write a web-based CGI Perl program that provides some information
about your lab or an experiment that you've
conducted. Include a means whereby users can send you email with
questions.
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