[Tickets #12235] Empty Expect-Header results in 417-Error using Squid

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Ticket URL: http://bugs.horde.org/ticket/12235
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  Ticket             | 12235
  Created By         | dire at fa.uni-tuebingen.de
  Summary            | Empty Expect-Header results in 417-Error using Squid
  Queue              | Horde Groupware Webmail Edition
  Version            | 5.0.4
  Type               | Bug
  State              | Unconfirmed
  Priority           | 1. Low
  Milestone          |
  Patch              |
  Owners             |
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dire at fa.uni-tuebingen.de (2013-05-03 14:36) wrote:

I discovered a problem as I wanted to add an external calendar from a  
server which is behind a Squid Proxy:
Horde sends an empty Expect-Header and Squid rejects this with an 417 Error.
As I removed the Expect-Header in  
/usr/share/php/Horde/Core/Factory/HttpClient.php it worked, but I  
don't know if the header is required somewhere else.