fix an issue where inputstream is sometimes lost.

[provenceee]

What type of PR is this?

Bug

What this PR does / why we need it?

fix an issue where inputstream is sometimes lost.

Which issue(s) this PR fixes？

Fixes #1646

Does this PR introduce a user-facing change?

No

Checklist

• Make sure there is a GitHub_issue related with this PR before you start working on it.
• Make sure you have squashed your change to one single commit.
• GitHub Actions works fine in this PR.

[codecov]

Codecov Report

Attention: Patch coverage is 81.39535% with 8 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...ring/interceptor/DispatcherServletInterceptor.java	61.53%	5 Missing ⚠️
...interceptor/AbstractHandlerMappingInterceptor.java	81.81%	1 Missing and 1 partial ⚠️
...sermant/router/spring/utils/SpringRouterUtils.java	88.88%	1 Missing ⚠️

Flag	Coverage Δ	Complexity Δ
unittests	43.97% <81.39%> (-0.05%)	181.00 <0.00> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ	Complexity Δ
...rmant/loadbalancer/interceptor/UrlInterceptor.java	76.00% <ø> (ø)	0.00 <0.00> (ø)
...t/loadbalancer/declarer/ClientFactoryDeclarer.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...itor/interceptor/DispatcherServletInterceptor.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
.../ServiceDiscoveryRegistryDirectoryInterceptor.java	75.00% <ø> (ø)	2.00 <0.00> (ø)
...ain/java/io/sermant/router/spring/entity/Keys.java	100.00% <100.00%> (ø)	0.00 <0.00> (?)
...sermant/router/spring/handler/AbstractHandler.java	35.71% <ø> (ø)	0.00 <0.00> (ø)
.../io/sermant/router/spring/handler/LaneHandler.java	89.47% <100.00%> (ø)	0.00 <0.00> (?)
...a/io/sermant/router/spring/handler/TagHandler.java	100.00% <100.00%> (ø)	0.00 <0.00> (?)
...sermant/router/spring/service/LaneServiceImpl.java	100.00% <ø> (ø)	0.00 <0.00> (ø)
...ava/io/sermant/router/spring/utils/RouteUtils.java	75.00% <ø> (+3.12%)	0.00 <0.00> (ø)
... and 3 more