Some people see thumbnails

[Dave Humphries]

Jack's posts are the only posts in this thread that I understand, and that includes my own posts.

Yeah, it was taught to me with diagrams, much easier to comprehend than words alone.

PS - Mike: are you still seeing the small image in the first post?

Cheers, Dave

[Mike Buckley]

PS - Mike: are you still seeing the small image in the first post?

Yes. I'm periodically checking the image in that thread and this thread. I'll let you know if a larger image is displayed. Notice that I wrote if rather than when by conscious intent.

[lunaticitizen]

Mike, could you do me a favor?

Could you copy and paste the text below in your Firefox address bar and press Enter? Do you see any "Cache Entry Information"?

about:cache-entry?storage=disk&context=&eid=&uri=http://s20.postimg.org/ut1is51bh/IMG_20151228_0001_Web.jpg

If the cache exists you should see something like this:

[Mike Buckley]

Yes, Leo, that document is displayed on my system.

[lunaticitizen]

I see. It means that the image (just the thumbnail) is indeed cached in your PC.

Could you clear the cache and see if the problem persists? Just copy and paste the text below in your Firefox address bar, press Enter, and then click on "Clear Now" on the right side of "Cached Web Content".

about:preferences#advanced

[Mike Buckley]

Leo,

I clicked "Clear Now." I didn't notice the disk space being used before clicking but it now says only 1 KB (that's correct; kilobytes) is being used. There is still no change in the display of the image in the first post of this thread.

[lunaticitizen]

Hmm... fascinating!

Then maybe the culprit is the client (your PC) after all. Something intercepts the image before it is rendered by Firefox and shows only the thumbnail. Firefox add-on, maybe? But you mentioned that it also happened with Edge. Hmm let me think for a while

[Dave Humphries]

Hmm... fascinating!

Then maybe the culprit is the client (your PC) after all. Something intercepts the image before it is rendered by Firefox and shows only the thumbnail. Firefox add-on, maybe? But you mentioned that it also happened with Edge. Hmm let me think for a while

Perhaps, but remember that two other members, both also in Virginia, one using Edge, one FireFox, see the same thing.

Now that's what I call a coincidence - i.e. I still think I'm right

Cue fall from grace

[Mike Buckley]

If it's my PC, why is it affecting only this image? By the way, I use no Firefox add-ons.

Cue fall from grace

I believe that already happened when you created this thread. Thank goodness Jack showed up with his thumbnail.

[george013]

Mike,
I keep thinking of what might cause the problem. Can you've a look at the network settings of FF? And tell us what proxyserver you're using?
And what windows you use.
George

[lunaticitizen]

After thinking about it again, now I'm not so sure the cause of the problem is the client

Currently known facts:

1. The image can be displayed if opened on a new tab. Below is the HTTP request headers sent by FireFox.
   

   GET /ut1is51bh/IMG_20151228_0001_Web.jpg HTTP/1.1
   Host: s20.postimg.org
   User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:43.0) Gecko/20100101 Firefox/43.0
   Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
   Accept-Language: ja,en-US;q=0.7,en;q=0.3
   Accept-Encoding: gzip, deflate
   Referer: https://www.cambridgeincolour.com/forums/thread50794.htm
   Cookie: __cfduid=d22f200af41ea3e81b28f2e0f2abd14711452210711
   Connection: keep-alive

2. Firefox/Edge fails to render the image correctly if it is embedded in a post. Below is the HTTP request headers sent by FireFox.
   

   GET /ut1is51bh/IMG_20151228_0001_Web.jpg HTTP/1.1
   Host: s20.postimg.org
   User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:43.0) Gecko/20100101 Firefox/43.0
   Accept: image/png,image/*;q=0.8,*/*;q=0.5
   Accept-Language: ja,en-US;q=0.7,en;q=0.3
   Accept-Encoding: gzip, deflate
   Referer: https://www.cambridgeincolour.com/forums/thread50794.htm
   Cookie: __cfduid=d22f200af41ea3e81b28f2e0f2abd14711452210711
   Connection: keep-alive

3. The problem only happens if the clients accessed the image from a particular geographical location.
4. Local cache is not the cause of the problem.
5. Browser addons are not the cause of the problem, either.

The HTTP request headers sent by the two requests are almost identical, except for the Accept header.

• If the image is opened on a new tab.
  

  Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8

• If the image is embedded in a post.
  

  Accept: image/png,image/*;q=0.8,*/*;q=0.5

Neither header is wrong in this case. My best guess, right now, is that the servers for this particular geographical location failed to interpret the header correctly (i.e., misconfiguration) and returns the thumbnail instead of the full image.

[Mike Buckley]

My best guess, right now, is that the servers for this particular geographical location failed to interpret the header correctly (i.e., misconfiguration) and returns the thumbnail instead of the full image.

I'm guessing that if that is the problem, it will probably always remain. Correct? I mention that in the context that it has been 49 hours since Steaphany posted her image and it is still not displaying properly on my system.

Dave's theory was that it would take days for the server to sort of fix itself. We are now at the start of the third day, so we know he at least got the time period correct.

[george013]

I'm guessing that if that is the problem, it will probably always remain. Correct? I mention that in the context that it has been 49 hours since Steaphany posted her image and it is still not displaying properly on my system.

Dave's theory was that it would take days for the server to sort of fix itself. We are now at the start of the third day, so we know he at least got the time period correct.

Mike,
If you go to the network settings in FF, then you know if you're using a proxy server or not.

George

[Mike Buckley]

Mike,
If you go to the network settings in FF, then you know if you're using a proxy server or not.
George

You dramatically overly estimate my technological abilities. Even if I could figure out whether I'm using a proxy server, I have no idea what the benefit of that knowledge would be.

[Mike Buckley]

Dave's theory was that it would take days for the server to sort of fix itself. We are now at the start of the third day, so we know he at least got the time period correct.

We now know that he got both parts correct. We are still in the third day since Steaphany first posted her image and it is finally being displayed properly on my system in both threads. Way to go, Dave!

[Dave Humphries]

Phew!

[george013]

You dramatically overly estimate my technological abilities. Even if I could figure out whether I'm using a proxy server, I have no idea what the benefit of that knowledge would be.

You can always ask, not so difficult. It's the same window as from where you emptied the cache, post 45. Click settings from connection and then choice "no proxy".

A proxy is a computer between you and the internet. Probably "use windows proxy settings" will be activated.
https://en.wikipedia.org/wiki/Proxy_server

I'm not sure if this is the problem, but I'm 100% sure it's something to check.

George