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[英]Handling 404 and internal server errors with perl WWW::Mechanize
[英]Handling GET errors in WWW::Mechanize
我正在使用一個腳本,該腳本使用WWW :: Mechanize從網站上抓取數據,並且除了網站本身之外,其他所有功能都運行良好。 有時它只是暫時沒有響應,並且對於給定的my $url = 'http://www.somesite.com/more/url/text'
我在$mech->get($url)
:
Error GETing http://www.somesite.com/more/url/text: Can't connect to www.somesite.com:443 at ./trackSomesite.pl line 34.
此錯誤有時會以無法識別的模式偶爾發生,並且根據我與我正在處理的網站的經驗,這是由於服務器不穩定。
我希望能夠明確知道發生此錯誤,而不是其他錯誤(例如Too many requests
。 我的問題是如何使我的腳本處理該錯誤而不死?
將$mech->get(...)
請求包裝在一個eval塊中,或者使用autocheck => 0
,然后檢查$mech->status
代碼和/或$mech->status_line
來決定要做什么。
這是一個例子:
#!/usr/bin/env perl
use WWW::Mechanize;
use constant RETRY_MAX => 5;
my $url = 'http://www.xxsomesite.com/more/url/text'; # Cannot connect
my $mech = WWW::Mechanize->new( autocheck => 0 );
my $content = fetch($url);
sub fetch {
my ($url) = @_;
for my $retry (0 .. RETRY_MAX-1) {
my $message = "Attempting to fetch [ $url ]";
$message .= $retry ? " - retry $retry\n" : "\n";
warn $message;
my $response = $mech->get($url);
return $response->content() if $response->is_success();
my $status = $response->status;
warn "status = $status\n";
if ($response->status_line =~ /Can['']t connect/) {
$retry++;
warn "cannot connect...will retry after $retry seconds\n";
sleep $retry;
} elsif ($status == 429) {
warn "too many requests...ignoring\n";
return undef;
} else {
warn "something else...\n";
return undef;
}
}
warn "giving up...\n";
return undef;
}
產量
Attempting to fetch [ http://www.xxsomesite.com/more/url/text ]
status = 500
cannot connect...will retry after 1 seconds
Attempting to fetch [ http://www.xxsomesite.com/more/url/text ] - retry 1
status = 500
cannot connect...will retry after 2 seconds
Attempting to fetch [ http://www.xxsomesite.com/more/url/text ] - retry 2
status = 500
cannot connect...will retry after 3 seconds
Attempting to fetch [ http://www.xxsomesite.com/more/url/text ] - retry 3
status = 500
cannot connect...will retry after 4 seconds
Attempting to fetch [ http://www.xxsomesite.com/more/url/text ] - retry 4
status = 500
cannot connect...will retry after 5 seconds
giving up...
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