add timeout log

[taoyuanyuan]

Issues associated with this PR

add timeout log

Sign the CLA

Make sure you have signed the CLA

Solutions

add timeout log

UT result

Unit Test is needed if the code is changed, your unit test should cover boundary cases, corner cases, and some exceptional cases.
And you need to show the ut result.

Benchmark

If your code involves the processing of every request, you should give the Benchmark Result

Code Style

• Make sure Goimports has run
• Show Golint result

[codecov-io]

Codecov Report

Merging #771 into stable will decrease coverage by 0.27%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           stable     #771      +/-   ##
==========================================
- Coverage    51.5%   51.23%   -0.28%     
==========================================
  Files         205      205              
  Lines       17020    17145     +125     
==========================================
+ Hits         8766     8784      +18     
- Misses       7360     7461     +101     
- Partials      894      900       +6

Impacted Files	Coverage Δ
pkg/proxy/downstream.go	34.29% <33.33%> (-0.05%)	⬇️
pkg/buffer/iobuffer.go	75.31% <0%> (-2.52%)	⬇️
pkg/stream/http/stream.go	12.68% <0%> (+2.31%)	⬆️

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