只需要读取页面的一部分(n个字节)并关闭连接,如何在AnyEvent::HTTP上执行此操作?
最佳答案
当块到达时,on_body
被重复调用。从on_body
返回false将终止下载。
sub my_http_request {
my $cb = pop;
my ($method, $url, %args) = @_;
croak("Unsupported: on_body") if $args{on_body};
croak("Unsupported: want_body_handle") if $args{want_body_handle};
my $max_to_read = delete($args{max_to_read});
my $data;
return http_request(
$method => $url,
%args,
on_body => sub {
#my ($chunk, $headers) = @_;
$data .= $_[0];
return !defined($max_to_read) || length($data) < $max_to_read;
},
sub {
my (undef, $headers) = @_;
$cb->($data, $headers);
},
);
}
像
my_http_request
一样使用http_request
,除了它接受可选的max_to_read
参数。例如,
my $cb = AnyEvent->condvar();
my_http_request(
GET => 'http://...',
...
max_to_read => ...,
$cb,
);
my ($data, $headers) = $cb->recv();
例如,
my $done = AnyEvent->condvar();
my_http_request(
GET => 'http://...',
...
max_to_read => ...,
sub {
my ($data, $headers) = @_;
...
$done->send();
},
);
$done->recv();
关于perl - 如何使用AnyEvent::HTTP仅获取页面的一部分?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/43355138/