programmatically get base url from inside google app engine endpoint method

[Katedral Pillon via StackOverflow]

I am creating a Google Appengine endpoint api. In one of the endpoint methods, I need to detect the base url. How might I do that in Java?

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[Romin via StackOverflow]

As per the documentation, you can pass an injected type into your API Methods. For e.g. you could inject the HTTPServletRequest object into your API Method. https://developers.google.com/appengine/docs/java/endpoints/paramreturn_types#injected_types

Once you have the Request object, you can then get the base url as needed. For e.g.

StringBuffer url = req.getRequestURL();
String uri = req.getRequestURI();
String ctx = req.getContextPath();
String base = url.substring(0, url.length() - uri.length() + ctx.length()) + "/";

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