fix: unexpected path in httpugprade

[ghosx]

resolves: #2740

Test the different performances of http.NewRequest for //s123/randomstring123 and /s123/randomstring123

package main

import (
	"fmt"
	"net/http"
	"os"
)

func main() {
	f1()
	f2()
}

func f1() {
	fmt.Println("f1:")
	s := "//s123/randomstring123"
	req, _ := http.NewRequest("GET", s, nil)
	req.Write(os.Stdout)
}

func f2() {
	fmt.Println("f2:")
	s := "/s123/randomstring123"
	req, _ := http.NewRequest("GET", s, nil)
	req.Write(os.Stdout)
}

Output：

go run .
f1:
GET /randomstring123 HTTP/1.1
Host: s123
User-Agent: Go-http-client/1.1

f2:
GET /s123/randomstring123 HTTP/1.1
Host: 
User-Agent: Go-http-client/1.1

[xiaokangwang]

Thanks for your contribution. I think this pull request is ready to be merged.

[codecov-commenter]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (62428d8) 36.97% compared to head (f060300) 36.95%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
transport/internet/httpupgrade/config.go	0.00%	7 Missing ⚠️
transport/internet/httpupgrade/dialer.go	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2773      +/-   ##
==========================================
- Coverage   36.97%   36.95%   -0.03%     
==========================================
  Files         671      672       +1     
  Lines       39685    39692       +7     
==========================================
- Hits        14673    14667       -6     
- Misses      23391    23404      +13     
  Partials     1621     1621              

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