v6.5.6 get goroutine pprof for pd with debug=2 report 400 error

[mayjiang0203]

Bug Report

Please answer these questions before submitting your issue. Thanks!

What did you do?

What did you expect to see?
no error.

Get by PD API succeeded.

sh-5.1# curl --cacert ca.crt --key tls.key --cert tls.crt https://tc-pd-0.tc-pd-peer.testbed-endless-fips-eks-fcn2l.svc:2379/debug/pprof/goroutine?debug=2 |more
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0goroutine 10773595 [running]:
runtime/pprof.writeGoroutineStacks({0x7f8d0299daf8, 0xc008708260})
        /usr/local/go/src/runtime/pprof/pprof.go:692 +0x70
runtime/pprof.writeGoroutine({0x7f8d0299daf8?, 0xc008708260?}, 0xc0005c4300?)
        /usr/local/go/src/runtime/pprof/pprof.go:681 +0x2b
runtime/pprof.(*Profile).WriteTo(0x2b1ae20?, {0x7f8d0299daf8?, 0xc008708260?}, 0xc?)
        /usr/local/go/src/runtime/pprof/pprof.go:330 +0x14b
net/http/pprof.handler.ServeHTTP({0x2c8fafd, 0x9}, {0x3900ab0, 0xc008708260}, 0x1c?)
        /usr/local/go/src/net/http/pprof/pprof.go:253 +0x4a5
net/http.(*ServeMux).ServeHTTP(0x3900ab0?, {0x3900ab0, 0xc008708260}, 0xc005b4ba00)
        /usr/local/go/src/net/http/server.go:2487 +0x149
[go.etcd.io/etcd/embed.(*accessController).ServeHTTP](http://go.etcd.io/etcd/embed.(*accessController).ServeHTTP)(0xc000915140, {0x3900ab0, 0xc008708260}, 0xc005b4ba00)
        /go/pkg/mod/[go.etcd.io/[email protected]/embed/serve.go:381](http://go.etcd.io/[email protected]/embed/serve.go:381) +0x4f9

What did you see instead?

What version of TiDB Dashboard are you using (./tidb-dashboard --version)?
v6.5.6

[mayjiang0203]

/severity moderate

[mornyx]

/assign