Add Response#headers to SOLANA_ERROR__RPC__TRANSPORT_HTTP_ERROR

[steveluscher]

Motivation

Get an HTTP error? Sometimes the headers have useful information, like your rate limit status. Your program might like access to those headers to decide what to do next.

Thanks to Hex Luther on Stack Exchange for the suggestion.

Example use case

try {
    const { value: latestBlockhash } = await rpc.getLatestBlockhash().send();
} catch(e) {
    if (isSolanaError(e, SOLANA_ERROR__RPC__TRANSPORT_HTTP_ERROR)) {
        if (e.context.code === 429 /* rate limit error */) {
            const retryAfterHeaderValue = e.context.headers.get('Retry-After');
            if (retryAfterHeaderValue != null) {
                // ...
            }
        }
    }
}

Details

Whatever you do, take care that the values of Headers don't get leaked through some logging system. Consider the response headers to be sensitive information.

[github-actions]

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