close http request body after read it.

[johncming]

close it after readhttp.Request.Body .

one of them is:

etcd/contrib/raftexample/httpapi.go

Lines 32 to 34 in 6da17cd

	func (h *httpKVAPI) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	key := r.RequestURI
	switch {

[codecov-io]

Codecov Report

Merging #10534 into master will increase coverage by 0.16%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #10534      +/-   ##
==========================================
+ Coverage   71.62%   71.78%   +0.16%     
==========================================
  Files         393      393              
  Lines       36521    36522       +1     
==========================================
+ Hits        26157    26219      +62     
+ Misses       8539     8487      -52     
+ Partials     1825     1816       -9

Impacted Files	Coverage Δ
lease/leasehttp/http.go	65.69% <100%> (+0.25%)	⬆️
pkg/fileutil/read_dir.go	91.3% <0%> (-8.7%)	⬇️
pkg/fileutil/purge.go	65.9% <0%> (-6.82%)	⬇️
clientv3/leasing/cache.go	87.77% <0%> (-3.89%)	⬇️
clientv3/leasing/txn.go	88.09% <0%> (-3.18%)	⬇️
raft/storage.go	89.81% <0%> (-1.86%)	⬇️
clientv3/leasing/kv.go	89.7% <0%> (-1%)	⬇️
etcdserver/api/rafthttp/pipeline.go	97.5% <0%> (ø)	⬆️
etcdserver/server.go	74.96% <0%> (+0.14%)	⬆️
clientv3/balancer/grpc1.7-health.go	59.3% <0%> (+0.29%)	⬆️
... and 20 more

---

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[xiang90]

@johncming can you squash 4 commits into 1?

[johncming]

@johncming can you squash 4 commits into 1?

ok. i will do it.