PHP curl does not resolve local host names

Question

I am using multiple local hostnames defined in the hosts file of my Windows machine.

For example: localhost, admin_a, admin_b, etc.

I would like to execute curl through PHP on such local hostnames, however the execution hangs and no result is returned.

$ch = curl_init(); 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
curl_setopt($ch, CURLOPT_URL, 'http://localhost');
curl_setopt($ch, CURLOPT_RESOLVE, [ 'localhost:80:127.0.0.1']);
$output = curl_exec($ch);

I tried with the option CURLOPT_RESOLVE (not documented on php.net) and it does not seem to help.

On the other hand, the curl command line in a bash console works instantly:

curl http://localhost

What should I do to get PHP curl returns something on locally defined hostnames?

Server: nginx

UPDATE

The php console returns this:

Rebuilt URL to : http://localhost/
Trying ::1...
TCP_NODEDELAY set
Trying 127.0.0.1...
TCP_NODEDELAY set
Connected to localhost (127.0.0.1) port 80 (#0)
> GET / HTTP/1.1
Host: localhost
Accept: */*

Then nothing happens, the page is just hanging returning nothing.

You try http://admin_a in command-line and admin_a in PHP thus getting different results is not a surprise. Curl is not a consumer grade browser. You should not expect it to auto-correct or auto-complete anything. — Álvaro González
– Álvaro González, Commented Dec 28, 2017 at 9:35
curl cli sends User-Agent header so try it with CURLOPT_USERAGENT defined. — Deadooshka
– Deadooshka, Commented Dec 28, 2017 at 18:43

hanshenrik · Accepted Answer · 2017-12-28 09:28:24Z

1

by default, curl try to guess the protocol based on the url, and my best guess is, it fails to guess the protocol for admin_a - you can probably get the same problem if you change your curl command to curl admin_a, anyway, change your setopt to curl_setopt($ch, CURLOPT_URL, 'https://admin_a'); - or alternatively, explicitly tell curl what to use with CURLOPT_DEFAULT_PROTOCOL, eg curl_setopt($ch,CURLOPT_DEFAULT_PROTOCOL,'https');

answered Dec 28, 2017 at 9:28

hanshenrik

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6 Comments

Vincent Over a year ago

I get no result using curl_setopt($ch, CURLOPT_URL, 'http://admin_a'); The script hangs and nothing is returned

hanshenrik Over a year ago

@Vincent strange, enable CURLOPT_VERBOSE and run it again, and make sure to log what goes to stderr (by default in nginx+php-fpm, stderr goes to nginx's error logs)

Vincent Over a year ago

I did that and I have updated my answer with the message returned in the PHP console.

hanshenrik Over a year ago

@Vincent that verbose log indicates that your localhost webserver is not responding.. does it work if you load localhost in your web browser?

Vincent Over a year ago

That is what exactly what I do not understand: if I access localhost in a separate tab, it works fine and return the proper message (a json string). I have 2 instances of php-cgi running, maybe it is an upstream issue with nginx. I don't where to look for anymore.

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