fix 'empty request scheme' (close #522)

[localvar]

No description provided.

[codecov-commenter]

Codecov Report

Merging #529 (0a5b3b5) into main (72065c9) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #529      +/-   ##
==========================================
- Coverage   80.59%   80.58%   -0.02%     
==========================================
  Files          87       87              
  Lines       10103    10113      +10     
==========================================
+ Hits         8143     8150       +7     
- Misses       1510     1512       +2     
- Partials      450      451       +1     

Impacted Files	Coverage Δ
pkg/cluster/mutex.go	79.31% <0.00%> (-4.91%)	⬇️

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