Welcome to the Treehouse Community
Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.
Looking to learn something new?
Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.
Start your free trialMarc Sanchez
20,039 PointsWorkspaces has been blocked by CORS
I'm getting the following error, "Access to fetch at 'https://dog.ceo/dog-api/breeds-list' from origin 'http://port-80-5omz7rsm19.treehouse-app.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled."
Here's my code:
const select = document.getElementById('breeds'); const card = document.querySelector('.card'); const form = document.querySelector('form');
// ------------------------------------------ // FETCH FUNCTIONS // ------------------------------------------ fetch('https://dog.ceo/dog-api/breeds-list') .then(response => response.json()) .then(data => console.log(data))
fetch('https://dog.ceo/api/breeds/image/random') .then(response => response.json()) .then(data => generateImage(data.message));
// ------------------------------------------
// HELPER FUNCTIONS
// ------------------------------------------
function generateImage(data) {
const html =
<img src="${data}" alt>
<p>click to view images of ${select.value}s</p>
;
card.innerHTML = html;
}
2 Answers
Steven Parker
231,269 PointsIt looks like this code is using the wrong URL for this API in the first "fetch". Here's what the video shows:
fetch('https://dog.ceo/api/breeds/list') //...
John Greer
12,029 PointsHey I ran into this same issue. I did some googling and found there are some tools to allow you to bypass this warning. This Stack Overflow answer offered this tool you can use as a proxy in front of your URL to get around this browser block.
You can set constants and use concatenation to append that to the front of all your URLs, but since I'm just trying to follow along with the video, I just added it in front and got this code which doesn't trigger the CORS error in browser
fetch(`https://cors-anywhere.herokuapp.com/https://dog.ceo/api/breeds/list/`)
.then(response=>response.json())
.then(data => console.log(data))
Hope this helps. I don't totally understand what's happening with the CORS error. It does seems specific to browsers though, since I can run a GET request to https://dog.ceo/api/breeds/list/ just fine using Postman, an app interface for making web requests to APIs.
Good luck!
Doron Geyer
Full Stack JavaScript Techdegree Student 13,897 PointsDoron Geyer
Full Stack JavaScript Techdegree Student 13,897 PointsNot sure why Steven's answer was downvoted here because he is correct. You have used the wrong URL for your fetch request. The one shown by Steven and the one used in the video works fine and doesnt give you the CORS error.
Seth Lewis
Full Stack JavaScript Techdegree Graduate 18,191 PointsSeth Lewis
Full Stack JavaScript Techdegree Graduate 18,191 PointsSteven,
I'm using the code from the snippet above and getting the 404 error. Are you getting that as well as of October 2020?
Steven Parker
231,269 PointsSteven Parker
231,269 PointsAfter starting with the original code, and then making the correction shown here, I get this in the console: