Poster screen caching bug ?

Archived
1

I’m running a Roku LT (firmware 4.0 - build 5060) and seeing some weird caching issues for poster images. I’m doing the standard cache busting (adding a query string parameter … i.e. ?v=) yet the poster image is not being retrieved. I first validated the correct image was being returned via a browser. I then used Wireshark and verified that the request is not being made from the Roku.

… has anyone else seen this issue ?

-Doug

Here is the code ..


movieInfoArray = ParseJson(response)

dt = CreateObject("roDateTime")
tss = dt.AsSeconds().ToStr()
			
if movieInfoArray <> invalid
	
	for i = 0 to (movieInfoArray.Count() - 1)
				
		movieInfoArray[i].hdPosterURL = movieInfoArray[i].hdPosterURL + "?v=" + tss
		movieInfoArray[i].sdPosterURL = movieInfoArray[i].sdPosterURL + "?v=" + tss
				
		print "hdPosterURL = " + movieInfoArray[i].hdPosterURL
		print "sdPosterURL = " + movieInfoArray[i].sdPosterURL
				
	end for
			
	screen.SetContentList(movieInfoArray)
				
end if
2

If there is an error in your json, then it would crash/return invalid which would use the prior url’s which are cached.
In the debug console what shows up for the print statements you already have?

3

Agreed … but no error parsing the JSON. The print statements show the correct URLs with the query string parameter, and the parameter changes each time i run the channel. I can change the image on the server, but the old image is still displayed.

Execution 1:

hdPosterURL = http://192.168.1.3:8989/roku/images/cat … NtemhixkbN

Execution 2:

hdPosterURL = http://192.168.1.3:8989/roku/images/cat … 2dvxKjqHMN

-Doug

4

If you change from json to xml does the problem go away?

5

Not sure on the XML (… and really don’t want to switch my code / feeds to XML)

I have worked around the issue, but don’t really understand why it didn’t work, if it’s a bug on my part or a bug in core Roku code. (All code compiled / executed)

The poster screen performs an HTTP request and shows an updated image if I modify the value in the roAssociativeArray this way …


movieInfoArray[i].AddReplace("HDPosterUrl", movieInfoArray[i].HDPosterUrl + "?" + m.cacheBuster)

The poster screen shows an old cached image if I modify the value in the roAssociativeArray this way …


movieInfoArray[i].HDPosterUrl = movieInfoArray[i].HDPosterUrl + "?" + m.cacheBuster