On 16/02/2021 14:58, Christopher Schultz wrote: > All, > > I'm sorry for using users@ as my own personal Google but I'm sure > someone knows this off the top of their head and can save me a lot of > reading. > > I'm wondering about which specs mention how to handle URL parameters > (and POST parameters, for that matter) in terms of ordering. For > example, if I have a URL like: > > https://example.com/context/resource?a=1&b=2&c=3&a=6 > > (Note that I have "a" in there twice) > > If I call request.getParameterNames(), is there a predictable order in > which those parameters will be handed back? I'd love to hear that not > only are they returned in "URL order" (that is, the left-most parameter > is the first returned in that enumeration) in Tomcat, but either the > servlet spec, the CGI spec, or some other spec dictates that order > explicitly.
Yes, they will be in that order. (See ApplicationHttpRequest.parameters, ParameterMap.delgatedMap and LinkedHashMap The order isn't explicitly defined in any specification I am aware of. However, the Servlet spec does state (3.1) that query string parameters should be presented before parameters parsed form the request body. There are several ways to implement that but it is likely that an implementation will simply maintain insertion order for keys and values (where there are multiple values for the same key) in a single collection. At least, Tomcat does this. > Similarly, if I use request.getParameterMap and than iterate through the > keys or Map.Entry objects in it, does that behave predictably as well? Same answer as above. > I have a situation where both URL parameters and POST parameters being > in URL-order (or document-order for POST parameters) would be highly > convenient, but I'd like to know if I can actually *rely* on that > behavior, or if I have to make arrangements to provide the ordering in a > separate parameter. You can rely on this if you are using Tomcat. I don't see the underlying design changing anytime soon. For other containers, YMMV. > I'd like to know which specs mention these things if they are indeed > specified in any of them. The only thing I am aware of is the query string before request body ordering in section 3.1. of the Servlet spec. Mark --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
