fix Qiniu auth headers & body

[lihsai0]

内部工单 KODO-14537

[codecov]

Codecov Report

Merging #391 (d5aaf81) into master (989b273) will increase coverage by 1.66%.
The diff coverage is 95.31%.

@@            Coverage Diff             @@
##           master     #391      +/-   ##
==========================================
+ Coverage   82.93%   84.60%   +1.66%     
==========================================
  Files          16       16              
  Lines        1313     1338      +25     
  Branches      274      279       +5     
==========================================
+ Hits         1089     1132      +43     
+ Misses        224      206      -18     

Impacted Files	Coverage Δ
qiniu/storage/rs.js	85.52% <91.66%> (ø)
qiniu/util.js	96.33% <100.00%> (+22.52%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 989b273...d5aaf81. Read the comment docs.