Some Images Have A "503 Service Unavailable" Error But When I Refresh Another One Has It...

[Nathan Johnson]

This is a really strange issue. One time it is "images/icons.png" that has the error and then I reload the page and that one doesn't have the error, but "images/refresh.png" has it that time.

 

Does anyone know what could be causing this?

 

I looked in JS Console:

 

 

It's getting on my nerves because sometimes one image wont display and then other times another image wont display.

 

Hopefully there's a fix to it.

 

By the way, I'm using Google Chrome. I also tried in Safari and Firefox and they both were having this issue.

[Guest xaav]

What server is your site on?

[Nathan Johnson]

What server is your site on?

 

Sorry, forgot to put that in my post. My site is on Stevie.

[Guest xaav]

Recently, there have been some abusive accounts on Stevie that have caused some recent, fairly long downtimes. In an effort to prevent this from happening again, I installed mod_vhost_limit, to limit the number of simultaneous connections to each site. I'll increase the connection limit, but I'm not going to disable it because I don't want Stevie to be having three hours of downtime every day because of some site that's hogging all the connections.

[Nathan Johnson]

Oh ok. I'll just put the 'refresh.png' image into the 'icons.png' CSS sprite instead so it will all be one connection. Don't connections close after the image is loaded?

[Guest xaav]

Okay, I've increased the limit from five to eight. If you leverage browser caching, you should be less likely to run into this limit.

[Nathan Johnson]

Okay, thanks.

[Ice IT Support]

What happens when you reach the limit? I believe one of my pages loads 8 simultaneous pages, but it is only accessed approx. once per month. I'll work on putting those onto a sprite though...

[Guest xaav]

First of all, you shouldn't reach that limit because browsers (are supposed to) only request two resources at a time. However, if you did reach that limit, your site would simply experience a "Service Temporarily Unavailable" page until the traffic subsided.

 

I do want to point out the fact that it takes about 1/10 of a second to serve a static resource, and since browsers fetch two resources at a time, you would need (10*8)/2, or 40 clients per second to cause this error.

[Nathan Johnson]

What happens if we use AJAX? Would that cause errors?

 

 

I do want to point out the fact that it takes about 1/10 of a second to serve a static resource, and since browsers fetch two resources at a time, you would need (10*8)/2, or 40 clients per second to cause this error.

 

Thanks for letting us know that.

[Guest xaav]

What happens if we use AJAX? Would that cause errors?

 

It shouldn't cause errors as long as there aren't 50 people spamming your site or something.

[Nathan Johnson]

What happens if we use AJAX? Would that cause errors?

 

It shouldn't cause errors as long as there aren't 50 people spamming your site or something.

 

Okay, that's good. I know I wont have that much users on so I think I'm good.