CORS Http request from JS client

Posted on Thu 23rd, May 2019

• #1

Bunny

Hi friends of Espruino,

I hope that all ours are OK.
Now I'm trying to connect to a Http server made in Espruino like http://forum.espruino.com/conversations/334253/#comment14748665 from JS Client, but happen a error of permission about Access-Control-Allow-Origin because my JS Client is in another server and my Espruino web server is in another IP. How can I enable CORS on Espruino or why's happening that?
• #2

MaBe

this is a good point to start reading

https://developer.mozilla.org/de/docs/Web/HTTP/CORS
• #3

Bunny

Ok I already read that. But How can I enable CORS on Espruino or why's happening that?
• #4

DrAzzy

use response.writeHead() and write out the CORS header that way.

I do it in this code - https://github.com/SpenceKonde/AzzyProjects/blob/master/Animate/Version9.js
• #5

MaBe
extend the res.writeHead and play around with the Access-Control headers
```
res.writeHead(200, {
'Content-Type': 'text/plain',
'Access-Control-Allow-Origin': '*',
'Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept'
});
```
https://developer.mozilla.org/de/docs/Web/HTTP/CORS#The_HTTP_response_headers

Let us know, if this works for you.

Look like I had missed to hit Post reply
• #6

Bunny in reply to @DrAzzy

Great way! It's works! Thanks all by your support.

Post a reply
- Bold
- Italics
- Link
- Image
- List
- Quote
- code
- Preview
Formatting Help

Don't worry about formatting, just type in the text and we'll take care of making sense of it. We will auto-convert links, and if you put asterisks around words we will make them bold.

Tips:

Create headers by underlining text with ==== or ----

To *italicise* text put one asterisk each side of the word

To **bold** text put two asterisks each side of the word

Embed images by entering:
![](https://www.google.co.uk/images/srpr/logo4w.png)
That's the hard one: exclamation, square brackets and then the URL to the image in brackets.

* Create lists by starting lines with asterisks

1. Create numbered lists by starting lines with a number and a dot

> Quote text by starting lines with >

Mention another user by @username

For syntax highlighting, surround the code block with three backticks:

```
Your code goes here
```
Just like Github, a blank line must precede a code block.

If you upload more than 5 files we will display all attachments as thumbnails.

For a full reference visit the Markdown syntax.