Pick what kind of option is useful to you and move on to the next section. If you haven't worked with dynamic URLs yet, feel free to head over to our blog post for that topic: dynamic urls in Retrofit 2 You can build the URL during runtime and request the exact file without any hacks. This can be especially helpful when downloading files, which are dependent of a parameter, user or time. You can now easily pass a dynamic value as full URL to the request call. You should not use anything else here, otherwise Retrofit will try to parse and convert it, which doesn't make sense when you're downloading a file. Please note, that we're specifying ResponseBody as return type. As you can see, it looks like a regular Retrofit 2 request declaration. If the file you want to download is a static resource (always at the same spot on the server) and on the server your base URL refers to, you can use option 1.

option 2: using a dynamic String fileUrl) For all you Retrofit experts: the request declaration for downloading files looks almost like any other request: // option 1: a resource relative to your base downloadFileWithFixedUrl() If you're reading this and you haven't written code for any Retrofit requests yet, please check our previous blog posts to get started.

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