I see there is an easy way to send a post with form values, but is there a function I could use to do essentially the same as PostForm but for a GET request?
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Basically, I want to construct the URL: https://uri.com?key=value but without using string concatenation with unescaped keys and values.
Encode the query parameters using Values.Encode. Concatenate the base URL and query parameters to get the actual URL.
resp, err := http.Get(fmt.Sprintf("%s?%s", baseURL, data.Encode())) 
As explained in this question, you probably don't actually want to do this. Most servers won't do anything useful with a form body in a GET request—and most that do will just treat it as synonymous with the same parameters sent in a query string, in which case you should just put them in the query string of your url.URL object in the first place.
However, if you do have a good reason to do this, you can. As the docs you linked explain, PostForm is just a thin convenience wrapper around NewRequest and Do. Just as you're expected to use NewRequest yourself if you want to add custom headers, you can use it to attach a body.
And if you look at the source to PostForm, it's pretty trivial:
return c.Post(url, "application/x-www-form-urlencoded", strings.NewReader(data.Encode())) Basically, instead of this:
resp, err := client.PostForm(url, data) … you do this:
body := strings.NewReader(data.Encode()) req, err := http.NewRequest("GET", url, body) req.Header.Set("Content-Type", "application/x-www-form-urlencoded") resp, err := client.Do(req) 