Cancelling request in onRequest handlers

[emileber]

Implements #17

[codecov]

Codecov Report

Merging #23 into master will increase coverage by 25%.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master    #23    +/-   ##
======================================
+ Coverage      75%   100%   +25%     
======================================
  Files           1      1            
  Lines           4      4            
======================================
+ Hits            3      4     +1     
+ Misses          1      0     -1

Impacted Files	Coverage Δ
test/mocks/MiddlewareMock.js	100% <100%> (+25%)	⬆️

---

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[codecov]

Codecov Report

Merging #23 into master will increase coverage by 25%.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master    #23    +/-   ##
======================================
+ Coverage      75%   100%   +25%     
======================================
  Files           1      1            
  Lines           4      4            
======================================
+ Hits            3      4     +1     
+ Misses          1      0     -1

Impacted Files	Coverage Δ
test/mocks/MiddlewareMock.js	100% <100%> (+25%)	⬆️

---

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 8556a24...77bdbfd. Read the comment docs.