Random 404 errors when editing posts

[Nacho_Caballero]

I’ve been getting random 404 errors when editing replies in my forum.

When edits work, they send a PUT request to the endpoint /posts/:post_id with a 200 response.

But when they don’t work, I can see in the developer tools a PUT request to /post_replies/:post_id that returns a 404. When I refresh the page, the errors go away and I’m able to save the edit correctly (via /posts/:post_id, the :post_id doesn’t change).

I’m not sure if there is a special condition that could make /posts turn into /post_replies by mistake or if it’s a different problem. I recently quadrupled my server’s RAM and I haven’t seen anything weird in the logs.

Any help is appreciated.

[Nacho_Caballero]

I continue to get these random errors when trying to save an edit for other people’s posts. It happens with both old and new posts, but always randomly:

And it goes away when I refresh the page and save the edit:

[Nacho_Caballero]

I’m on the latest version and can confirm this is still happening: trying to save an edit on other another user’s post randomly triggers a dialog box with a not_found message:

The requested URL or resource could not be found.

If I reload the page and press the “Save Edit” button again, the error goes away and the edit is saved.

[Falco (Rafael dos Santos Silva)]

Those two requests are getting PUT to different URLs.

[Nacho_Caballero]

Right. But why? I’m pressing the same “Save Edit” button in the same post. The only difference is a page refresh

[Falco (Rafael dos Santos Silva)]

Maybe try checking the browser backtrace next time it happens? Since it’s hitting different endpoints it may be going via different methods in the EmberJS app.

[Nacho_Caballero]

@Falco It just happened again. This is all I see when I open the console after I get the error:

And if I try saving again with the console open:

Then I refresh the page and it lets me edit:

This is the path of the initiator (VM73:1 Script):

[Nacho_Caballero]

I just updated to 2.7.0.beta2 and it’s still happening:

• Try to edit post reply 47994
• PUT https://mydomain.com/post_replies/47994 => 404 The requested URL or resource could not be found. In console: Failed to load resource: the server responded with a status of 404 () /post_replies/47994:1
• Reload the page
• Try to edit post reply 47994
• PUT https://mydomain.com/posts/47994 => 200 success

If there’s any other information that would help debug it, I’d be happy to provide it.

[Nacho_Caballero]

This happened 3 times today in less than an hour

Is there anything else I could do to help track this bug down?

[Nacho_Caballero]

@Falco I finally figured out how to consistently reproduce this bug:

1. Disable enable filtered replies view
2. Click on the arrow on a reply:
3. Click on the arrow to jump to the original message:
4. Click on the edit icon:
5. Make a change and hit “Save changes”. You’ll get a dialog box saying that the URL or resource wasn’t found (404).

[pmusaraj (Penar Musaraj)]

Thanks @Nacho_Caballero, the specific steps were very helpful. I have a PR up with a fix: FIX: 404 error when editing an expanded reply by pmusaraj · Pull Request #12504 · discourse/discourse · GitHub

[Nacho_Caballero]

No problem! Such an easy fix

[codinghorror (Jeff Atwood)]

As usual thank you for your patience with us Nacho – when you provide very detailed repros we can almost always whip up a fix!