peek timeout set to idle timeout

[nejisama]

Issues associated with this PR

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UT result

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Code Style

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[taoyuanyuan]

LGTM

[codecov-io]

Codecov Report

Merging #1040 into master will decrease coverage by <.01%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master    #1040      +/-   ##
==========================================
- Coverage   55.59%   55.58%   -0.01%     
==========================================
  Files         247      250       +3     
  Lines       23905    24023     +118     
==========================================
+ Hits        13290    13354      +64     
- Misses       9395     9446      +51     
- Partials     1220     1223       +3

Impacted Files	Coverage Δ
pkg/network/connection.go	34.97% <ø> (ø)	⬆️
pkg/types/network.go	0% <ø> (ø)	⬆️
pkg/server/handler.go	40.53% <100%> (ø)	⬆️
pkg/mtls/conn.go	27.58% <50%> (ø)	⬆️
pkg/stream/stream.go	33.33% <0%> (-13.34%)	⬇️
pkg/module/http2/transport.go	78.47% <0%> (-0.15%)	⬇️
pkg/proxy/var.go	6.02% <0%> (ø)	⬆️
pkg/variable/factory.go	41.93% <0%> (ø)
pkg/variable/var.go	94.11% <0%> (ø)
pkg/variable/api.go	45.28% <0%> (ø)
... and 1 more

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