'"HTTP error" when running composer update

I'm on Windows 7. I get this error on composer update:

  [Composer\Downloader\TransportException]
  The "http://packagist.org/p/provider-2015-07%24eec61011fe6ec03b5dc7d406c70116caac2c28b7cb520e5a11a900b4afe8af7b.j
  son" file could not be downloaded: failed to open stream: HTTP request failed!

composer self-update

 You are already using composer version edf14dab1561096c10c71c7dfd81597ff94995a7.

Same error everytime.

composer-php

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'"HTTP error" when running composer update

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