I see an interface called eth_sendRawTransaction, but the params-- which interface is used to generate the pre-signed transaction?
You will be doing that with whatever SDK or library you are using to manage your private keys, craft, and sign your transactions. Transactions are signed locally and relayed to the network via Infura.
There are several ways to do this. You can see one example in this blog post here: https://medium.com/coinmonks/signing-and-making-transactions-on-ethereum-using-web3-js-1b5663207d63
Thank you very much for your reply. Now I use web3.js, it seems that there is a cross-domain error, but I have added the request header in the back end, which doesn’t seem to work.
