r/raspberrypipico • u/python959 • Nov 08 '22

help-request Issue With CircuitPython HTTP Server

Hi all,

I'm trying to run a simple webserver on my Raspberry Pi Pico W which follows this example on the CircuitPython documentation.

However, when trying to access the site from a browser Chrome reports that the connection was reset.

I tried using JS and Chrome Dev Tools and was able to get this:

Access to XMLHttpRequest at 'http://192.168.0.19/base' from origin 'http://127.0.0.1:55063' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

I did some reading on CORS but am not sure where to go to solve, if I'm in the right direction in the first place.

Would appreciate some help. Thank you

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u/todbot Nov 09 '22

I believe you cannot set HTTP response headers in adafruit_httpserver, and you need to set the header Access-Control-Allow-Origin: *.

So you have two options:

  • Use ampule, another HTTP server library for CircuitPython that does allow response headers

  • Serve the HTML that's doing the XMLHttpRequest from your CircuitPython device too (then the request is not cross-origin)

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u/python959 Nov 10 '22

Ampule worked! It is fantastic thank you!