fix jp_ws_fetch not work by its own #441

[eastonsuo]

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[blink1073]

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[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (master@40c477b). Click here to learn what that means.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #527   +/-   ##
=========================================
  Coverage          ?   76.29%           
=========================================
  Files             ?      110           
  Lines             ?     9809           
  Branches          ?     1067           
=========================================
  Hits              ?     7484           
  Misses            ?     1944           
  Partials          ?      381           

Impacted Files	Coverage Δ
jupyter_server/pytest_plugin.py	90.76% <100.00%> (ø)

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