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If you want to create a clone of the URL but with a different query string, while leaving the original URL unchanged, you need to create a copy of the original url.URL struct first.
There are a couple of ways to do this. You can either re-parse the URL, or you can dereference the original url.URL and make a copy, like so:
When you do this, you create a new newURL variable of type url.URL which is initialized to the (dereferenced) value of *originalURL. This means that newURL has a different address in memory to originalURL.
Putting this together, the pattern for creating a new URL with different parameters is:
As a side note, you can use this technique any time you want to 'clone' a URL and make changes to it. For example to create a clone of a URL with a different path, you can do this:
If you enjoyed this article, you might like to check out my recommended tutorials list or check out my books Let's Go and Let's Go Further, which teach you everything you need to know about how to build professional production-ready web applications and APIs with Go.