How can I check whether the server is able to handle SOAP requests

You can use:

if (extension_loaded('soap')) {  // Do things}

php soap nusoap soap-client

From SSH you can run:

php -i | grep Soap

that will return something like:

Soap Client => enabledSoap Server => enabled

php soap nusoap soap-client

In PHP to check whether SOAP enabled or not use built in function class_exists():

var_dump(class_exists("SOAPClient"));

It also could be user to check any of modules classes.

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