Errata

Perl & LWP

Errata for Perl & LWP

Submit your own errata for this product.

The errata list is a list of errors and their corrections that were found after the product was released. If the error was corrected in a later version or reprint the date of the correction will be displayed in the column titled "Date Corrected".

The following errata were submitted by our customers and approved as valid errors by the author or editor.

Color key: Serious technical mistake Minor technical mistake Language or formatting error Typo Question Note Update

Version Location Description Submitted By Date submitted Date corrected
Printed
Page xi
Under the heading "Foreword", add a subheading "by Gisle Aas"

Anonymous   
Printed
Page xiv
Second line

Correct
http://www.w3.org/TR/html401/interact/forms/
to
http://www.w3.org/TR/html401/interact/forms
(just removing the final "/")

 Anonymous   
Printed
Page 7
Table 1-1

Several things wrong with the table contents. Here it is, all fixed:

Distribution CPAN directory Minimal Version Needed

libwww-perl modules/by-module/Net 5.68
URI modules/by-module/URI 1.23
libnet modules/by-module/Net 1.12
HTML-Tagset modules/by-module/HTML 3.03
HTML-Parser modules/by-module/HTML 3.27
HTML-Tree modules/by-module/HTML 3.17
MIME-Base64 modules/by-module/MIME 2.16
Compress-Zlib modules/by-module/Compress 1.19
Digest-MD5 modules/by-module/Digest 2.23

 Anonymous   
Printed
Page 7
end of first paragraph after the table

After "get the latest." add a new sentence:
"This book is about the latest version of LWP! Upgrade now!"

 Anonymous   
Printed
Page 7
in the paragraph before heading "Unpack and configure"

Change both instances of
authors/id/G/GA/GAAS
to
modules/by-module/MIME

 Anonymous   
Printed
Page 11
example 1-1

change "use LWP::Simple;" to "use LWP::Simple 1.36;"

 Anonymous   
Printed
Page 11
example 1-2

change "use LWP;" to "use LWP 5.58;"

 Anonymous   
Printed
Page 12
example 1-3

change "use LWP::UserAgent;" to "use LWP::UserAgent 2.003;"

 Anonymous   
Printed
Page 13
example 1-5

change "use HTML::TreeBuilder;" to "use HTML::TreeBuilder 3.13;"

 Anonymous   
Printed
Page 14
end of the chapter text

Add a new section with a heading "Upgrade Now!" with this as the text:

If you're having trouble getting any code from the book to work, the
absolute first thing you should do is make sure you've got a recent version
of LWP installed! Here's my favorite incantation for seeing what version
you have:
perl -e "use LWP 1000000000"
It will say something like:
LWP version 1000000000 required--this is only version 5.68 at -e line 1.
BEGIN failed--compilation aborted at -e line 1.

If the version number you see in "this is only version 5.68" is lower that
5.68, upgrade! This book is not about old versions of LWP, but just about
modern versions -- the more modern the better, since we're constantly
improving its performance and interface. If you're using an old version,
you're missing out on years of improvements that Gisle, me, and many others
have added for you.

Just to pick two examples: in older LWP versions, you would load the class
HTTP::Cookies::Netscape not with the expected "use HTTP::Cookies::Netscape"
line, but with "use HTTP::Cookies". Moreover, old versions didn't
understand cookies files from recent Mozilla versions. A more compelling
example is that in old LWP versions, LWP::UserAgent had no $browser->get or
$browser->post methods -- and this book uses those methods heavily, because
the alternative is a much less friendly syntax: use HTTP::Request::Common;
$browser->request(GET(...),...); and the like.

 Anonymous   
Printed
Page 16

The examples at the bottom of page 16 and the top of 17 mistakenly show
"+" separating form=value pairs. It should be "&"!
So:

Take this:
name=Hiram%20Veeblefeetzer+age=35+country=Madagascar
and correct to:
name=Hiram%20Veeblefeetzer&age=35&country=Madagascar

And later, take this:
$query = "name=$n+age=$a+country=$c";
print $query;
name=Hiram%20Veeblefeetzer+age=35+country=Madagascar
and correct it to:
$query = "name=$n&age=$a&country=$c";
print $query;
name=Hiram%20Veeblefeetzer&age=35&country=Madagascar

 Anonymous   
Printed
Page 17
the second line from the bottom

Correct

<html>

to

</html>

 Anonymous   
Printed
Page 19
Last sentence

The code font is used for the word "print" in the last sentence on page 19:

"Some functions return the document, others save or print the document."

Since this is _not_ a reference to a function, the word "print" should not use the
code font.

 Anonymous   
Printed
Page 24
example 2-5

change "use LWP;" to "use LWP 5.58;"

 Anonymous   
Printed
Page 28
1st new paragraph, 7th line down on the page.

Take this:
(doc, status, success, resp) = do_GET(URL, [form_ref, [headers_ref]]);
And correct it to:
(doc, status, success, resp) = do_POST(URL, [form_ref, [headers_ref]]);

 Anonymous   
Printed
Page 31
third code line

change "use LWP;" to "use LWP 5.58;"

 Anonymous   
Printed
Page 32
2nd paragraph, second line

There's slightly too much space after the comma in "a firemwall, or"

 Anonymous   
Printed
Page 37
Fifth (non-code) paragraph, second sentence

Correct to:

If this $browser object has a protocols_allowed list (and most don't),
then is_protocol_supported returns true only for protocols that are in
that list, and which LWP supports. But if $browser object is normal in
not having a protocols_allowed list, then is_protocol_supported returns
true for any protocol that LWP supports and which isn't in
protocols_forbidden.

 Anonymous   
Printed
Page 40
second codeblock, fifth and sixth lines

Correct both instances of "$response" to "$resp".

 Anonymous   
Printed
Page 40
six lines from the bottom

Correct
my $resp = $browser->get('http://www.perl.com'
to
my $resp = $browser->get('http://www.perl.com',
(just adding a comma to the end)

 Anonymous   
Printed
Page 41
first line of first new codeblock

Correct
my $resp = $browser->get('http://www.perl.com/'
to
my $resp = $browser->get('http://www.perl.com/',
(just adding a comma to the end)

 Anonymous   
Printed
Page 41
first line of second-to-last codeblock

Correct
my $resp = $browser->get('http://www.perl.com/'
to
my $resp = $browser->get('http://www.perl.com/',
(just adding a comma to the end)

 Anonymous   
Printed
Page 43
The first line of the 2nd and 5th code examples under "Status Line"

Correct "$resp = " to "$response = ".

 Anonymous   
Printed
Page 45
second-to-last codeblock

Correct the line:
$mins = int($age/60); $age -= $minutes * 60;
to
$mins = int($age/60); $age -= $mins * 60;

 Anonymous   
Printed
Page 47
Third line of the last paragraph

Correct "LWP::Cookies" to "HTTP::Cookies"

 Anonymous   
Printed
Page 48
first code line

change "use URI;" to "use URI 1.23;"

 Anonymous   
Printed
Page 51
last line, second from last paragraph

reads:
userinfo, server, or port components).

should be:
userinfo, host, or port components).

Also, on the NEXT line, "server()" should be "host()"

 Anonymous   
Printed
Page 53
The third line of each of the first two code sections

Correct "$uri->" to "$url->".
(Look close!)

 Anonymous   
Printed
Page 59
fifth line, paragraph after code sample

reads:
city, state, and a submit button called zip.

should be:
city, state, zip, and a submit button called Search

 Anonymous   
Printed
Page 59
second to last paragraph, next to last line

reads:
call to call
should be:
call

 Anonymous   
Printed
Page 61
example 5-1

change "use URI;" to "use URI 1.23;"

 Anonymous   
Printed
Page 75
Second-from-last line of the codeblock

"ds" => "30",
should be:
"ds" => "100",

 Anonymous   
Printed
Page 85
first code line

change "use LWP::Simple;" to "use LWP::Simple 1.36;"

 Anonymous   
Printed
Page 97
about a dozen lines down

Correct this line:
die "Couldn't get $doc_url: ", $resp->status_line
to:
die "Couldn't get $doc_url: ", $response->status_line

 Anonymous   
Printed
Page 97
14th non-blank codeline, right under "{ # Get..."

Take
$doc_url = $response->request->base;
and correct it to:
$doc_url = $response->base;

 Anonymous   
Printed
Page 98, 99
All the code in this section

Sorry, this code doesn't work anymore -- Weather Underground has changed
their HTML at least twice since the book went to press. You're on your
own with getting it to work -- and (the hard part) KEEPING it working.

 Anonymous   
Printed
Page 105
second "#" line in the codeblock in the middle of the page.

Correct this comment line:
# process the text in $text->[1]
to this:
# process the text in $token->[1]

 Anonymous   
Printed
Page 105
third code line

change "use HTML::TokeParser;" to "use HTML::TokeParser 2.24;"

 Anonymous   
Printed
Page 106
Next-to-last paragraph

Book reads:
<img src="mybc1998.jpg" src="BC1998! WHOOO!">
Should be (with alt attribute)
<img src="mybc1998.jpg" alt="BC1998! WHOOO!">

 Anonymous   
Printed
Page 111
Start of new paragraph in the middle of the page

Clarify
If you though the contents of $url could be very large,
to
If you thought the content in $resp could be very large,

 Anonymous   
Printed
Page 120
3rd paragraph, 2nd sentence

"actual" should be "actually"

 Anonymous   
Printed
Page 122
three lines under the new heading "First Code"

change "use HTML::TokeParser;" to "use HTML::TokeParser 2.24;"

 Anonymous   
Printed
Page 126
first line under the heading "Debuggability"

correct "all the links" to "all the lines"

 Anonymous   
Printed
Page 134
example 9-2

change "use HTML::TreeBuilder 3;" to "use HTML::TreeBuilder 3.13;"

 Anonymous   
Printed
Page 135
Parse Options Section

Two incidents of mistake.

A) In example beginning with
$comments = $root->strict_comment();
last statement incorrectly reads
$comments = $root->strict_comments(); -- Omit 's'

B) Two paragraphs later beginning with
$root->strict_comments([boolean]);
Incorrect with 's' again, should read
$root->strict_comment([boolean]);

 Anonymous   
Printed
Page 140
Second paragraph under "Traversing" heading

Correct
The traverse() method lets you both:
to
The traverse() method lets you do both:

 Anonymous   
Printed
Page 144
first codeblock

Add before the first line:
use URI;

 Anonymous   
Printed
Page 144
about eight lines into the first codeblock

Correct
if(@children == 1 and ref $children[0] and $children[0]->tag eq 'a')
to
if(@children == 1 and ref $children[0] and $children[0]->tag eq 'a') {
(Just adding a "{" at the end)

 Anonymous   
Printed
Page 149
example 10-1

change "use HTML::TreeBuilder;" to "use HTML::TreeBuilder 3.13;"

 Anonymous   
Printed
Page 149
Example 10-1 (lines 11 and 16 of code)

The attribute should be 'class' not 'style'. The value should be 'mutter' not
'mumble' (cf. p. 148).

Take
$h3c->attr('style', 'scream');
and correct to
$h3c->attr('class', 'scream');

And take
$h3r->attr('style', 'mumble');
and correct to:
$h3r->attr('class', 'mutter');

And in the dump on page 150, the bolded line, correct the second and third
bolded lines to:
<h2 class="scream"> @0.1.0
and to
<h2 class="mutter"> @0.1.1

 Anonymous   
Printed
Page 151
Second line of the last paragraph

Correct
"There's no point is"
to
"There's no point in"

 Anonymous   
Printed
Page 152
HTML example, sixth-from-last line

Take
<tr class="top_button_bar">
and correct to:
<tr class="bottom_button_bar">

 Anonymous   
Printed
Page 166
last codeblock

change "use HTTP::Cookies;" to "use HTTP::Cookies 1.30;"

 Anonymous   
Printed
Page 174
2nd line of first codeblock

Take
$browser->name('ReportsBot/1.01');
and correct to
$browser->agent('ReportsBot/1.01');

 Anonymous   
Printed
Page 175
the first paragraph's fifth line

Correct
is password protected
to
is password-protected

 Anonymous   
Printed
Page 178
1st paragraph, 4th line

"writing" should be "write"

 Anonymous   
Printed
Page 181
second code line

change "use LWP::RobotUA;" to "use LWP::RobotUA 1.19;"

 Anonymous   
Printed
Page 187
the last codeblock's first line

Correct
my %notable_url_error; # URL => error messageS
to
my %notable_url_error; # URL => error message
(Just removing the "S")

 Anonymous   
Printed
Page 195

Take
my $hit_limit = $option{'h'} || 500;
and correct it to:
my $hit_limit = $option{'n'} || 500;

[i.e. 'n' for 'network hits', not 'h' for 'help']

 Anonymous   
Printed
Page 196
about 3/5ths of the way thru the codeblock

Correct
sub report { # This that gets run at the end.
to
sub report { # This gets run at the end.

 Anonymous   
Printed
Page 220
entry for character 982

The character should not be an uppercase pi, but instead should be
a lowercase pi that looks like an omega with a crossbar --
just like TeX varpi -- as seen at http://interglacial.com/~sburke/varpi.gif

 Anonymous   
Printed
Page 228
four lines from the bottom

Correct
it's term (how long
to
its term (how long
(Just deleting the apostrophe)

 Anonymous