如何将定界字符串解析为子字符串切片？

Given a URL like the following:

http://127.0.0.1:3001/find?fields=hostname,App,Node_type,invalid

I extract fields into a slice like this:

filters := r.URL.Query().Get("fields")
fmt.Println(filters)

Result:

hostname,App,Node_type,invalid

It is received as a string, but I'd prefer to separate the substrings into a sequence.

I think your URL should be

http://127.0.0.1:3001/find?fields=hostname&fields=App&fields=Node_type&fields=invalid

or if you don't like that, you can parse

filterSlice:=strings.Split("filters", ",")

The question actually concerns how to split a string on a particular delimiter. For that, you can use the strings.Split() function:

import "strings"
// ...
filters := strings.Split(r.URL.Query().Get("fields"), ",")

Your filters variable will now be a slice, which may be empty if there was no "fields" query parameter available.