fix(jsonrpc): Limit header size to avoid unexpected OOM

[justxuewei]

This patch limits the max size of header to 8Mib to avoid OOM issues.

[codecov-commenter]

Codecov Report

Merging #2466 (60c1dcd) into main (8b43135) will increase coverage by 0.90%.
Report is 24 commits behind head on main.
The diff coverage is 47.18%.

❗ Current head 60c1dcd differs from pull request most recent head 5b59f4c. Consider uploading reports for the commit 5b59f4c to get more accurate results

@@            Coverage Diff             @@
##             main    #2466      +/-   ##
==========================================
+ Coverage   44.27%   45.17%   +0.90%     
==========================================
  Files         304      269      -35     
  Lines       18528    18190     -338     
==========================================
+ Hits         8203     8218      +15     
+ Misses       9467     9095     -372     
- Partials      858      877      +19     

Files	Coverage Δ
common/host_util.go	85.18% <ø> (+14.81%)	⬆️
filter/metrics/filter.go	100.00% <100.00%> (ø)
filter/otel/trace/attachment.go	100.00% <ø> (ø)
filter/otel/trace/filter.go	71.01% <100.00%> (ø)
metrics/prometheus/rt_vec.go	100.00% <100.00%> (ø)
metrics/reporter.go	0.00% <ø> (ø)
metrics/util/aggregate/aggregator.go	100.00% <100.00%> (ø)
protocol/jsonrpc/server.go	14.76% <0.00%> (ø)
common/url.go	61.73% <0.00%> (-0.27%)	⬇️
registry/zookeeper/service_discovery.go	17.15% <60.00%> (+0.29%)	⬆️
... and 12 more

... and 35 files with indirect coverage changes

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[chickenlj]

LGTM.