Firefox: Error: NetworkError when attempting to fetch resource

[sattinos]

Steps to reproduce

Follow the example in the documentation:
https://in3.readthedocs.io/en/develop/api-wasm.html?highlight=html#in3-in-browser

Expected behavior

The latest block info, such as:

{
  "author": "0x005e288d713a5fb3d7c9cf1b43810a98688c7223",
  "difficulty": "0xec64a82f7ead3",
  "extraData": "0x707079652d786e706f6f6c2e636e2f5838",
  "gasLimit": "0xbea427",
  "gasUsed": "0xbe9f47",
  "hash": "0xd66f5ce664bf84db7c49ea6e3207958423b65aa1ea2f19947acf44c8b6180acd",
  "logsBloom": "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",
  "miner": "0x005e288d713a5fb3d7c9cf1b43810a98688c7223",
  "mixHash": "0x06938c2999ecbeb79fdccae5d8a8560d9d66afc44354ca728973804bd931fc7d",
  "nonce": "0xf450a29159a3093e",
  "number": "0xb23eee",
  "parentHash": "0x21b5946db99a367e8812f791e56876ca01d9cd73bd4e351a85e8f980018e3be0",
  "receiptsRoot": "0x0081106086f32b182518d0998c066ecce6f445c7cf6631e13a8d8ba6f941ebbd",
  "sealFields": [
    "0xa006938c2999ecbeb79fdccae5d8a8560d9d66afc44354ca728973804bd931fc7d",
    "0x88f450a29159a3093e"
  ],
  "sha3Uncles": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
  "size": "0xcb1e",
  "stateRoot": "0x726c7063e07a04f161ab8ac261512c2a85b7dcdec05297c76b4908939e942011",
  "timestamp": "0x6005f60c",
  "totalDifficulty": "0x44b3ced6740cb09d925",
  "transactions": [
    "0xaa57bd9de2c89843065b4b308ad662cd5bc1063a170d8b6f00b210d99d74bbab",
    "0xbd4376500d6e54ea93eac89e65786d640920b21359754c85a2c559b5aa5f26f3"
  ],
  "transactionsRoot": "0x4dfff8e9046f4e65fbbd3b5df3b147215b9cfbc51c04b3f1c84687f104c92501",
  "uncles": []
}

index.html.txt

Actual behavior

NetworkError when attempting connect to fetch resource

System configuration

The example is executed in Firefox 84.0.2

Incubed version

3.2.0

Request

Incubed Configuration

{ chainId: 0x1, replaceLatestBlock: 6, requestCount: 3 }

Chain

0x1

[simon-jentzsch]

Can you give some more details, like the console output or a way to reproduce it?
Also, did you run it in a https-enviroment? The reason why I'm asking is that there a few nodes in the nodelist only supporting http, which causes an exception in an https-enviroment, but incubed will then retry with a different node.

[sattinos]

This is a sample that has exactly the same problem. It will run on Chrome only.

[simon-jentzsch]

Thanks, I found the issue and fixed it.
The Problem was that the server the incubed nodes per default set the cors headers, but use
Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept

But Firefox also sends the user-agent even if this would not be a allowed header and then complains about it. So I added the User-Agent as allowed header and now it works with firefox as well. The only issue is, that it may taks some time to update all the nodes.

[sattinos]

After running:
npm upgrade in3-wasm
I was able to run the app from Firefox browser.
The issue is fixed now. Thank you.