Cancel in-flight HTTP request?

[Felipe Gasper]

Hi all,

Does Mojo::UA offer a control to cancel an in-flight HTTP request? I don’t see one in the docs but wonder if I’m just missing it.

(The promise, of course, can be pre-resolved/rejected, but that doesn’t appear to affect the underlying HTTP request.)

Thank you!

cheers,
-Felipe

[Dmitry L.]

https://metacpan.org/pod/Mojo::Transaction#completed

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//wbr, Dmitry L.

[Felipe Gasper]

Thank you!

When I try:

====
use Mojo::UserAgent;

my $ua = Mojo::UserAgent->new;

my $p = $ua->get_p('http://www.google.com');

Mojo::Promise->timer(0.01)->then( sub { print "canceling\n"; $p->completed() } );

Mojo::Promise->timer(2)->wait();
====

… then strace that script, the request continues even after the call to completed().

Am I just “holding it wrong”?

cheers,
-FG

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[Sebastian Riedel]

You can set a response error on the transaction to cancel it safely. That's what the Mojolicious tests use.

--

sebastian

[Dmitry L.]

> my $p = $ua->get_p('http://www.google.com');
>

https://metacpan.org/pod/Mojo::UserAgent#get_p returns a Mojo::Promise object

> Mojo::Promise->timer(0.01)->then( sub { print "canceling\n"; $p->completed() } );
>

https://metacpan.org/pod/Mojo::Promise doesn't have `completed` method
your are calling

You have to build Mojo::Transaction via $ua->build_tx and do ->completed on it



--
//wbr, Dmitry L.

[Felipe Gasper]

Ahh ok. Yeah I realized after my initial response to you that that was what was going on there. (And my mojo isn’t new enough to have the nifty new unhandled-rejection warning.)

I’ll look into this (and Sebastian’s as well). Thank you!

-FG

[Felipe Gasper]

Follow-up to this … it’s still not canceling.

=====
use v5.26;
use Mojo::UserAgent;

$| = 1;

my $ua = Mojo::UserAgent->new();

my $tx = $ua->build_tx( GET => 'http://google.com' );
$tx->on( connection => sub { $tx->completed(); say "canceled" } );

$ua->start_p($tx)->then( sub { say "finished" } );

Mojo::IOLoop->timer(2, sub { Mojo::IOLoop->stop() });

Mojo::IOLoop->start();
=====

It prints “canceled”, but strace shows that it continues with the request after then. Is there something else I need to do?

Sebastian: Do you recall off-hand which tests set a response error from the client logic? I’ve looked over the ones that seem like they might be related, but I’ve not found it.

Thank you both!

cheers,
-Felipe