[Bug 1976619] [NEW] Version 7.81 breaks support for multi-line header

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Olivier Gayot (ogayot):

In curl 7.81, the support of multi-line headers is broken.


This causes regressions in python-tornado:

```
                    self.stop()
    
            timeout_handle = self.add_timeout(self.time() + timeout, timeout_callback)
        self.start()
        if timeout is not None:
            self.remove_timeout(timeout_handle)
        assert future_cell[0] is not None
        if future_cell[0].cancelled() or not future_cell[0].done():
            raise TimeoutError("Operation timed out after %s seconds" % timeout)
>       return future_cell[0].result()
E       tornado.curl_httpclient.CurlError: HTTP 599: Header without colon
```

** Affects: curl (Ubuntu)
     Importance: Undecided
     Assignee: Olivier Gayot (ogayot)
         Status: Confirmed

** Affects: python-tornado (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: curl (Debian)
     Importance: Unknown
         Status: Unknown


** Tags: update-excuse
-- 
Version 7.81 breaks support for multi-line header
https://bugs.launchpad.net/bugs/1976619
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