How to the fetch() function in PyScript with options

Question

I am confused about the use of the fetch() function in PyScript.

There seems to be two versions of that function:

from the js module
from the pyscript module

Only the first one seems to accept two arguments.

I want to include header informations like so:

request_options = {
  "method": "GET",
  "headers": { "charset": "UTF-8" }
}
        
url = "https://www.nanobooks23.de/material/schachclub2.json"
response = await fetch(
  "https://corsproxy.io/?" + url,
  request_options
)

This only works with the fetch() function from the js module.

Otherwise I'll receive an

TypeError: fetch() takes 1 positional argument but 2 were given

So, how can I include the headers when using the fetch() function from the pyscript module?

I am using PyScript version 2024.9.2

avifen · Accepted Answer · 2024-10-05 09:22:21Z

0

All the other except the url argument are keyword arguments, the url is the only positional argument.

Pass the arguments directly as body = body or use **{options}.

You cant pass them without keywords inside an object.

answered Oct 5, 2024 at 9:22

avifen

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6 Comments

Peter M. Over a year ago

When calling fetch like this response = await fetch( "corsproxy.io?" + url, method = "GET", headers = { "charset": "UTF-8" } ) I'll receive an "pyodide.ffi.JsException: TypeError: Failed to fetch" PS: I looks like another answer and my comment had been deleted?

avifen Over a year ago

I think that specifically with headers, you should wrap the object by headers = to_js({headers})

Peter M. Over a year ago

Now I'll get an "TypeError: Object of type JsProxy is not JSON serializable" error - I have to do some more research, but it works with fetch() from the js module

avifen Over a year ago

Im just going to the pyscript docs for giving answers, they are very comfortable and they are searchable so you can refer to them. Specifically on using headers - in the doc example, when using headers, they create an object of headers, wrap it with to_js, take all options including the "js" headers and put in another object, arranged with the names "headers=jsheaders" etc. and wrap all the options object by another to_js, and then give it to fetch as options=options

Peter M. Over a year ago

It just don't work for me when using something simple like headers={ "Content-Type": "application/json"}. It always leads to an pyodide.ffi.JsException: TypeError: NetworkError when attempting to fetch resource. When leaving out headers and just providing url and method with the fetch() function from PyScript it works. I could not find anything in the PyScript docu.

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