URI().Path bytes to string about fasthttp

[valyala]

Hi @iowelinux ,

fasthttp API doesn't provide Path().String() because it cannot be implemented reliably without memory allocation. There is a hack, which allows converting []byte to string without memory allocation, but it may break in new go versions, so fasthttp API doesn't use it. So just use string(URI().Path()) if you cannot use []byte result. This will allocate memory for string and copy []byte contents into string. Or use the aforementioned hack on your own risk :)

Update:

Go doesn't allocate memory and do not copy []byte contents to string in the following cases:

path := ctx.Path()

// 1. string() is cheap in comparisons
if string(path) == "/foo/bar" {
    doSomething()
}

// 2. string() is cheap in select
select string(path) {
case "/foo":
case "/bar":
}

// 3. string() is cheap when used as map key
m := make(map[string]struct{})
m[string(path)] = struct{}{}
_, ok := m[string(path)]

[valyala]

@iowelinux , see the update for string conversion exceptions.