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Browser was unable to load all of Trello's resource getting in REST API

Vitalii Zghonnik
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July 12, 2023

Hello! Can you help me to figure out the issue which occurs when I try to create either a checklist or get members or add comments to cards, for example, using Postman to interact with Trello REST API? I get responses in text/HTML format with the following consistent:

Your browser was unable to load all of Trello’s resources. They may have been blocked by your firewall, proxy, or browser configuration.
Press Ctrl+F5 or Ctrl+Shift+R to have your browser try again and if that doesn’t work, check out our troubleshooting guide .
To use Trello, please enable JavaScript.

However, it doesn’t occur when I do it in UI Trello.

On the other hand, I can get/create/update/delete boards, lists, and cards. 

I went through the troubleshooting guide list of probable causes (given above) but it doesn’t help. Also checked that my browsers like Chrome or Microsoft Edge have allowed JavaScript.

I'll be appreciated for any help. Screenshot (6).pngScreenshot (9).png

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Alina Kurishko
Atlassian Team
Atlassian Team members are employees working across the company in a wide variety of roles.
July 14, 2023

Hi Vitalii, 

Welcome to the Atlassian Community! 

Hmm, that does sound weird. I understand that you're able to perform those same actions through Trello UI, but this type of error usually means there's a local setting that is blocking Trello.

Apart from this article, I might suggest you look through this one, too: 

https://support.atlassian.com/trello/docs/configuring-your-firewall-for-trello/ 

If you don't use any firewall software, could I ask you to create a ticket through https://trello.com/contact? This gives us access to a few more tools to help investigate, and we can discuss information that can't be shared in the community.

Alina | The Trello Team

Vitalii Zghonnik
I'm New Here
I'm New Here
Those new to the Atlassian Community have posted less than three times. Give them a warm welcome!
July 16, 2023

Hello Alina,

Thank you so much for your reply and thoughts about the probable reason that causes the issue. I got help from another person, whom I’m very thankful also.
It was totally my mistake, I missed out following characters in the URL field /1 which has to be included between https://api.trello.com/ and /cards/ in order to make it works in the right way.

Also in the console viewing that first I got status 301 Moved Permanently and then I got status 200 which brought me the response that the browser was unable to load of Trello’s resources (attached above).

However, I want to mention an additional circumstance that has taken place.
Recently Trello has developed another view of REST API documentation (at choice to try) which I pick up while I have pending adding more requests to the collection. This is actually how this pattern of view looks like:Screenshot 2023-07-15 new view .png

But I started to work with collection requests using an older view (classic view) of the API where /1 in URL address was putting out beyond the base URL.

Screenshot 2023-07-15 old view .png

I hope it makes some sense, and maybe it’ll be helpful for someone else in the future.

Alina Kurishko
Atlassian Team
Atlassian Team members are employees working across the company in a wide variety of roles.
July 17, 2023

Hi Vitalii, 

Oh, that's interesting! Thanks for sharing! And I'm glad to hear the issue's now resolved. 

I'll keep this solution in mind when supporting Trello users with similar issues. I've also reported this discrepancy to our development team who're responsible for keeping the Trello REST API documentation up to date. 

Thanks again for your time and cooperation! 

Alina | The Trello Team

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