JSON-RPC error: transport error: unexpected HTTP code: 400

[CITGuru]

I keep getting this error when making RPC calls with this library.

pub async fn fetch_new_blocks() -> Result<(), Box<dyn Error>> {
    let rpc_url = "rpc_url";
    
    let client = Client::new(&rpc_url, Auth::None).expect("Failed to create client");
    let best_block_hash = client.get_best_block_hash()?;
    println!("best block hash: {}", best_block_hash);
    let current_height = client.get_block_count()?;
    println!("{}", current_height);
    Ok(())
}

Error:

JSON-RPC error: transport error: unexpected HTTP code: 400

PS: My RPC URL does not have a username and password. The URL contains a token for auth

[apoelstra]

Is it an HTTPS URL?

[CITGuru]

Yes

…

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[apoelstra]

Unfortunately this library doesn't support HTTPS right now because the underlying JSONRPC library (rust-jsonrpc) has only been recently updated to support a HTTPS-supporting backend (minreq).

We need to update our copy of rust-jsonrpc and enable the minreq feature on it.

[CITGuru]

@apoelstra is it something you need help with?

[mprakhov17]

Hello, do you have any updates on this ticket? It's weird that rust-bitcoincore-rpc can't work with HTTPS

[apoelstra]

Bitcoin Core doesn't use HTTPS..

But anyway yes, now rust-jsonrpc has a minreq backend which supports HTTPS.

[irnb]

I checked the code and saw that the minreq feature is activated for jsonrpc,
but I’m still encountering HTTPS-related issues with the library. Is there any additional configuration I need to set up to enabling https?

[apoelstra]

It might be sufficient to add an explicit minreq dependency and enable its TLS features (which are not enabled by this library).