title: Bazel build behind proxy
body: <p>I would like to follow tensorflow example to build <a href="https://www.tensorflow.org/tutorials/sequences/audio_recognition" rel="noreferrer">generate_streaming_test_wav</a> to generate test wav. And my bazel version is 0.16.1.</p>
  
  <p>The problem is when I use command <code>bazel run tensorflow/examples/speech_commands:generate_streaming_test_wav
  </code>, the following error message shown up:</p>
  
  <pre><code>xxx@xxx:~/kws/tensorflow-0911$ bazel run tensorflow/examples/speech_commands:generate_streaming_test_wav
  Starting local Bazel server and connecting to it...
  ERROR: error loading package '': Encountered error while reading extension file 'closure/defs.bzl': no such package '@io_bazel_rules_closure//closure': Error downloading [https://mirror.bazel.build/github.com/bazelbuild/rules_closure/archive/dbb96841cc0a5fb2664c37822803b06dab20c7d1.tar.gz, https://github.com/bazelbuild/rules_closure/archive/dbb96841cc0a5fb2664c37822803b06dab20c7d1.tar.gz] to /home/janet/.cache/bazel/_bazel_janet/2d14dc1ff5782da202e00efcc3cd86bc/external/io_bazel_rules_closure/dbb96841cc0a5fb2664c37822803b06dab20c7d1.tar.gz: All mirrors are down: []
  ERROR: error loading package '': Encountered error while reading extension file 'closure/defs.bzl': no such package '@io_bazel_rules_closure//closure': Error downloading [https://mirror.bazel.build/github.com/bazelbuild/rules_closure/archive/dbb96841cc0a5fb2664c37822803b06dab20c7d1.tar.gz, https://github.com/bazelbuild/rules_closure/archive/dbb96841cc0a5fb2664c37822803b06dab20c7d1.tar.gz] to /home/janet/.cache/bazel/_bazel_janet/2d14dc1ff5782da202e00efcc3cd86bc/external/io_bazel_rules_closure/dbb96841cc0a5fb2664c37822803b06dab20c7d1.tar.gz: All mirrors are down: []
  INFO: Elapsed time: 57.573s
  INFO: 0 processes.
  FAILED: Build did NOT complete successfully (0 packages loaded)
  FAILED: Build did NOT complete successfully (0 packages loaded)
  </code></pre>
  
  <p>However, I can use <code>wget</code> download those two packages. 
  1.<code>https://mirror.bazel.build/github.com/bazelbuild/rules_closure/archive/dbb96841cc0a5fb2664c37822803b06dab20c7d1.tar.gz</code> 2.<code>https://github.com/bazelbuild/rules_closure/archive/dbb96841cc0a5fb2664c37822803b06dab20c7d1.tar.gz</code>
  I think my network should be fine. I have no idea why it can't download those files. </p>
  
  <p>Any idea or suggestions would be very appreciated!</p>