Fix build for older PHP versions that don't allow passing return values as a reference to a function.

Bugfix: there's a couple of places in SimpleSAML\Utils\HTTP where we should use the host AND port if the latter is not the default one, but we are only using the host. These are the case for evaluating the 'trusted.url.domains' configuration options (we should allow the host and port we are reachable in, but not other ports in the same host) and the method that returns the host with path, which should include the port if that's not standard (the documentation of the method already says so).

Rename Utils\HTTP::getSelfHostWithoutPort() to Utils\HTTP::getSelfHostWithNonStandardPort(), change the logic, and reimplement Utils\HTTP::getSelfHost() to depend on use the former. Complete the tests to include the case of port 443 while using HTTPS.

Don't gather the proxy.auth setting if we don't use it

(being respectful with occurences that might change the behaviour, i.e. default database prefixes)

Raise InvalidArgumentException if $retryURL is not a string AND is not null

Use InvalidArgumentException instead of SimpleSAML_Error_Exception when dealing with wrong input parameters.

Move SimpleSAML_Utilities:: checkCookie() to SimpleSAML\Utils\HTTP::checkSessionCookie() and deprecate the former.

SimpleSAML_Utilities::resolvePath was moved incorrectly to \SimpleSAML\Utils\HTTP instead of \SimpleSAML\Utils\System. Fix that.

Move SimpleSAML_Utilities:: redirectUntrustedURL() to SimpleSAML\Utils\HTTP:: redirectUntrustedURL() and deprecate the former.

Move SimpleSAML_Utilities:: checkURLAllowed() to SimpleSAML\Utils\HTTP:: checkURLAllowed() and deprecate the former.

Move SimpleSAML_Utilities:: redirectTrustedURL() to SimpleSAML\Utils\HTTP:: redirectTrustedURL() and deprecate the former.

Move SimpleSAML_Utilities:: setCookie() to SimpleSAML\Utils\HTTP:: setCookie() and deprecate the former.

Move the createPostRedirectLink(), postRedirect() and createHttpPostRedirectLink() methods in SimpleSAML_Utilities to \SimpleSAML\Utils\HTTP. The last one is made private, the others are renamed to submitPOSTData() and getPOSTRedirectURL(), respectively. Deprecate the three old ones.

Move SimpleSAML_Utilities::normalizeURL() to SimpleSAML\Utils\HTTP::normalizeURL() and deprecate the former.

Move SimpleSAML_Utilities::resolveURL() to SimpleSAML\Utils\HTTP::resolveURL() and deprecate the former.

Move SimpleSAML_Utilities::selfURLNoQuery() to SimpleSAML\Utils\HTTP::getSelfURLNoQuery() and deprecate the former.

Move SimpleSAML_Utilities::selfURL() to SimpleSAML\Utils\HTTP::getSelfURL() and deprecate the former.

Move SimpleSAML_Utilities::selfURLhost() to SimpleSAML\Utils\HTTP::getSelfURLHost() and deprecate the former.

Move SimpleSAML_Utilities::getFirstPathElement() to SimpleSAML\Utils\HTTP::getFirstPathElement() and deprecate the former.

Move SimpleSAML_Utilities::getSelfHostWithPath() to SimpleSAML\Utils\HTTP::getSelfHostWithPath() and deprecate the former.

Move SimpleSAML_Utilities::getSelfHost() to SimpleSAML\Utils\HTTP::getSelfHost() and deprecate the former.

Move SimpleSAML_Utilities:::getAcceptLanguage() to SimpleSAML\Utils\HTTP::getAcceptLanguage() and deprecate the former.

Move SimpleSAML_Utilities:::getBaseURL() to SimpleSAML\Utils\HTTP::getBaseURL() and deprecate the former.

Move SimpleSAML_Utilities:::resolvePath() to SimpleSAML\Utils\HTTP::resolvePath() and deprecate the former.

Move SimpleSAML_Utilities::addURLparameter() to SimpleSAML\Utils\HTTP::addURLParameters() and deprecate the former.

Move SimpleSAML_Utilities::parseQueryString() to SimpleSAML\Utils\HTTP::parseQueryString() and deprecate the former.

Move SimpleSAML_Utilities::getServerHosst(), getServerHTTPS() and getServerPort() to SimpleSAML\Utils\HTTP.