Cannot subscribe to external calendar

[powerpaul17]

Problem shows up when entering a "https://..." ical URL in the "New Subscription" dialog. The log shows an ssl_error but wget/curl works for the URL.

I found out that the "&" in URL gets replaced by & and subsequent fopen() (in stream_last_modified()) fails.

If the changed URL is entered in a browser (or by using curl/wget) it then shows an error 501.

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[powerpaul17]

Just realized that a similar error happens with the Facebook Birthday calendar. It is impossible to refresh it because the "&" character got replaced by &.