I have a related question. I noticed that the served images have Cache-Control:max-age=0. Are the served images not immutable? If I write a new blob to the same blob key, would that be served under the same image URL? Is there a way to create an image serving URL that serves an immutable, cacheable image?
On Sun, Apr 24, 2016 at 1:17 AM, 'Adam (Cloud Platform Support)' via Google App Engine <google-appengine@googlegroups.com> wrote: > Turning a blob key into a serving URL isn't a simple string > transformation. The blob must be made available on a special image serving > infrastructure that supports resizing and cropping. The Python > documentation > <https://cloud.google.com/appengine/docs/python/refdocs/google.appengine.api.images#google.appengine.api.images.get_serving_url> > provides some more details on this than the Go docs do. > > The recommended practice is to cache the serving URL and only regenerate > it when needed, as Christian mentioned. > > On Saturday, April 23, 2016 at 6:03:00 PM UTC-4, David de Kloet wrote: >> >> I need the blob key to be able to delete the blob, so I thought it >> wouldn't make sense to store both the blob key and the image URL. >> It might make sense for the reason you mention, but I'd first like to >> understand why it's so slow or whether I'm doing something wrong, before I >> store redundant data. >> >> On Sat, Apr 23, 2016 at 9:46 PM, Christian F. Howes wrote: >> >>> i haven't measured the time it takes for the transformation recently, >>> but note that the serving URL does not change, so i only generate it when a >>> new blob is uploaded and store the URL on the object in my datastore so >>> that it takes 0 time to generate in the future. >>> >>> On Saturday, April 23, 2016 at 5:35:18 AM UTC-7, David de Kloet wrote: >>>> >>>> Hello, >>>> >>>> I just noticed that turning a blob key into an image serving URL is >>>> very slow, often over 200ms. >>>> Is this expected or am I doing something wrong? >>>> I assumed that turning a blob key into a serving URL would be a simple >>>> string transformation, but even if it needs to make a request to another >>>> service, 200ms seems very slow. >>>> If it makes any difference, I'm using Go, and I just noticed that the >>>> "appengine" libraries have been deprecated by " >>>> google.golang.org/appengine", but I haven't updated yet. >>>> >>>> Thanks, >>>> David >>>> >>> -- >>> You received this message because you are subscribed to a topic in the >>> Google Groups "Google App Engine" group. >>> To unsubscribe from this topic, visit >>> https://groups.google.com/d/topic/google-appengine/MxQE5A_dKVM/unsubscribe >>> . >>> To unsubscribe from this group and all its topics, send an email to >>> google-appengine+unsubscr...@googlegroups.com. >>> To post to this group, send email to google-appengine@googlegroups.com. >>> Visit this group at https://groups.google.com/group/google-appengine. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/google-appengine/4bb00a30-3b0b-4555-8c98-20cc6a299ca7%40googlegroups.com >>> <https://groups.google.com/d/msgid/google-appengine/4bb00a30-3b0b-4555-8c98-20cc6a299ca7%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- > You received this message because you are subscribed to a topic in the > Google Groups "Google App Engine" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/google-appengine/MxQE5A_dKVM/unsubscribe > . > To unsubscribe from this group and all its topics, send an email to > google-appengine+unsubscr...@googlegroups.com. > To post to this group, send email to google-appengine@googlegroups.com. > Visit this group at https://groups.google.com/group/google-appengine. > To view this discussion on the web visit > https://groups.google.com/d/msgid/google-appengine/a11701b9-21ac-421b-b02f-a489d911f2ca%40googlegroups.com > <https://groups.google.com/d/msgid/google-appengine/a11701b9-21ac-421b-b02f-a489d911f2ca%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-appengine+unsubscr...@googlegroups.com. To post to this group, send email to google-appengine@googlegroups.com. Visit this group at https://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/CAKxRKifrDjpRZVshCRDnwPgKaSTiUm2iPJLwQwAPN2RLA1k_7A%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
