Debugging AJAX calls in smart contract transactions on a DApp with Web3.js
I'm upgrading from an older version and I'm stuck on something that should probably be simple... I've been banging my head against this for hours... During development of a decentralized application (DApp) that interacts with Ethereum smart contracts, I've run into issues with the AJAX requests that are failing intermittently. My setup includes Web3.js v1.6.0 and I'm using Axios for making requests to my backend API that communicates with the smart contracts. What complicates matters is that the failures don't produce consistent error messages, leading me to believe they might be related to the asynchronous nature of both AJAX calls and blockchain transactions. In one instance, I’m trying to fetch transaction receipts after sending a transaction, but the AJAX call to retrieve the receipt seems to time out frequently: ```javascript const sendTransaction = async () => { const txHash = await web3.eth.sendTransaction({...}); // Using Axios to fetch transaction receipt axios.get(`https://api.mybackend.com/tx/${txHash}`) .then(response => { console.log('Transaction receipt:', response.data); }) .catch(error => { console.error('Error fetching transaction receipt:', error); }); }; ``` I’ve tried increasing the timeout setting in Axios, but that didn’t resolve the issue: ```javascript axios.defaults.timeout = 10000; // 10 seconds timeout ``` Furthermore, I’m logging the transaction hash and the status returned from Ethereum, yet there are times when the transaction status is not updated in time for the AJAX call to execute successfully. I’ve thought about implementing a retry mechanism, considering that the blockchain might take longer to propagate the transaction status under high network load conditions. Would implementing a polling strategy to check for the transaction status be advisable? I’m curious if there are best practices for handling such AJAX calls in a DApp context where you’re relying heavily on smart contract interactions. Additionally, if there are any specific configurations in the Web3.js setup that could influence the success rate of these AJAX requests, I would greatly appreciate those insights too. For context: I'm using Javascript on Ubuntu. I recently upgraded to Javascript stable. I appreciate any insights!