Feat: Let "ReadBody" return more detailed error

[zhyee]

- Let "ReadBody" return more detailed error
- Optimize the performance of "CatURL" func

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[zhyee]

@coanor +review PR

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: zhyee

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[coanor]

@zhyee

将 array 优化成 map，在基础数据量比较小（~ 10 个左右）的情况下，基本没什么提升。

当基础数据量在 32 个时，map 会比 array 快 30% 左右。参见如下示例：

func BenchmarkMapArray(b *T.B) {
	arr := []string{
		"1",
		"2",
		"3",
		"4",
		"5",
		"6",
		"7",
		"8",

		"10", "110", "1110",
		"20", "120", "1120",
		"30", "130", "1130",
		"40", "140", "1140",
		"50", "150", "1150",
		"60", "160", "1160",
		"70", "170", "1170",
		"80", "180", "1180",
	}

	farr := func(x string) bool {
		for _, ent := range arr {
			if ent == x {
				return true
			}
		}

		return false
	}

	dict := map[string]bool{
		"1": true,
		"2": true,
		"3": true,
		"4": true,
		"5": true,
		"6": true,
		"7": true,
		"8": true,

		"10": true, "110": true, "1110": true,
		"20": true, "120": true, "1120": true,
		"30": true, "130": true, "1130": true,
		"40": true, "140": true, "1140": true,
		"50": true, "150": true, "1150": true,
		"60": true, "160": true, "1160": true,
		"70": true, "170": true, "1170": true,
		"80": true, "180": true, "1180": true,
	}

	fdict := func(x string) bool {
		_, ok := dict[x]
		return ok
	}

	b.Run(fmt.Sprintf("arr-%d", len(arr)), func(b *T.B) {
		for i := 0; i < b.N; i++ {
			farr(fmt.Sprintf("%d", i%len(arr)))
		}
	})

	b.Run(fmt.Sprintf("dict-%d", len(dict)), func(b *T.B) {
		for i := 0; i < b.N; i++ {
			fdict(fmt.Sprintf("%d", i%len(arr)))
		}
	})
}

结果：

goos: darwin
goarch: arm64
pkg: gitlab.jiagouyun.com/cloudcare-tools/demo/x
BenchmarkMapArray
BenchmarkMapArray/arr-32
BenchmarkMapArray/arr-32-10         	17134858	        69.84 ns/op	       1 B/op	       0 allocs/op
BenchmarkMapArray/dict-32
BenchmarkMapArray/dict-32-10        	20657643	        57.55 ns/op	       1 B/op	       0 allocs/op
PASS
ok  	gitlab.jiagouyun.com/cloudcare-tools/demo/x	3.679s