Questions tagged [cors]
Use this tag when you see a message in the browser devtools console about CORS (Cross-Origin Resource Sharing) — e.g., your browser logged an error about Access-Control-Allow-Origin, and you want to know how to eliminate the error. Also for other questions on the CORS protocol (defined in https://fetch.spec.whatwg.org/ as a way to use response headers to tell browsers to relax the same-origin policy and allow cross-origin XHR/Fetch/Ajax requests).
17
questions
2
votes
1
answer
12
views
Is there a way to only allow minting from a website's domain? I'm looking for a way other than whitelisting to prevent bot attacks on my nft launch
I have an NFT contract that uses merkle proofs to ensure that everyone who mints an NFT has been whitelisted. My mint function takes merkleProof as a parameter and runs isValidMerkleProof(merkleProof, ...
- 339
1
vote
0
answers
24
views
CORS Issue with the /quote 0x API endpoint
I'm a new web2 fullstack web dev trying to get his feet in web3 and i've tried to create my first web3 dApp.
For the profile section and displaying a users' NFT and tokens balances I easily managed my ...
- 11
0
votes
0
answers
52
views
fetching pinata works in dev environment but in production it does not?
I have an Nft contract and this is fetching on react.js
const fetchNfts=async () => {
const nfts = [] as Nft[];
const onSaleNfts = await contract!.getAllNftsOnSale();
for (let i = 0; i ...
- 1,424
0
votes
0
answers
21
views
Can not view my listed NFTS on my NFT Marketplace frontend
I followed alchemy road to web3 tutorial on NFT market place. After listing the NFTs and then go to the market place to view my listed NFTs I get a has been blocked by CORS policy error.
I used "...
- 11
1
vote
2
answers
314
views
Access blocked by CORS policy
I have an Ubuntu machine running two docker nodes. When I try to access nodes from my web based application, installed on the same machine I keep getting the following error :
web3.min.js:2 Access to ...
1
vote
0
answers
308
views
Etherscan now using No 'Access-Control-Allow-Origin' header is presen
First post here. I've been building quite well making a game on Ethereum but mainly just been trying to get the basics right and concentrating on the deposit and withdraw section of my dapp. ...
- 21
0
votes
1
answer
87
views
Cors Issue with Hyper Ledger Private Block chain network on Aws
I am new to hyper ledger and trying to set up a private block chain network with clique as consensus protocol. I am deploying it on a AWS Ec2 Instance.
Followed these steps and initiated a boot node ...
- 11
1
vote
1
answer
523
views
Cross Origin Blocked? Setting up Infura provider [closed]
useEffect(() => {
const loadWeb3 = async () => {
const web3 = new Web3(
new Web3.providers.HttpProvider("https://mainnet.infura.io/censored")
);
let n = await web3....
- 121
2
votes
1
answer
915
views
Couldn't connect to node because cross-origin request is blocked
I am running a full rinkeby node via
geth --rinkeby --rpc --rpcapi db,eth,net,web3,personal --cache=2048 --unlock="..." --password ... --rpccorsdomain "*" --allow-insecure-unlock --rpcaddr "...
- 121
1
vote
3
answers
2k
views
WEB3JS CORS ERROR
I have a empty html file that call to a js file. Inside that file I have this coded.
if (typeof web3 !== 'undefined') {
web3 = new Web3(web3.currentProvider);
} else {
// set the provider you ...
2
votes
3
answers
2k
views
Unable to execute web3.eth.accounts[0]
I'm following along with this short tutorial and ran into a few problems. I'm running testrpc in my console. However, every time I run my index.html I get an error. My index.html file is the following:...
- 135
2
votes
0
answers
172
views
Can not access quorum's contract from webpage *CORS*
I am getting following error on browser's console while accessing contracts.
Failed to load http://localhost:22000/: Response to preflight request doesn't pass access control check: No 'Access-...
- 188
2
votes
1
answer
1k
views
Can no more connect to my local node using web3
I start my local node using the following command:
geth --datadir "D:\EthereumLocalNode" --networkid 1114 console 2>> "D:\EthereumLocalNode\myLog.log" --rpc --rpccorsdomain "*" --nodiscover --...
17
votes
2
answers
28k
views
What is http://localhost:8545?
Why do some ethereum related websites (for example regis.nu, there are many others) tell me they cannot find a node running at http://localhost:8545 and what can I do about that?
Regis.nu allowed me ...
- 9,774
4
votes
1
answer
3k
views
Browser will not connect to running Geth: NS_ERROR_UNKNOWN_PROTOCOL
My Geth tutorial Greeter contract runs fine from the command line. I tried to make a front end that just outputs the string from Greeter, but the browser console returns the error, '...
- 673
1
vote
1
answer
245
views
How to offer free DApps for users without any barriers? [duplicate]
How to offer decentralized applications or services for users without introducing any barriers like
running a full ethereum node?
enabling rpc api on the node?
explaining the user which rpc cors ...
- 32.4k
4
votes
1
answer
460
views
Is it possible to check which RPC APIs are available?
Is it possible for a decentralized application to get details about the offered JSON-RPC APIs from the local ethereum node?
I want to check the following specs in the following order using web3.js:
...
- 32.4k