Merge pull request #47 from status-im/request-header-callback

request header callback

web3.nim

@@ -68,16 +68,18 @@ proc newWeb3*(provider: RpcClient): Web3 =
   provider.setMethodHandler("eth_subscription") do(j: JsonNode):
     r.handleSubscriptionNotification(j)
 
-proc newWeb3*(uri: string): Future[Web3] {.async.} =
+proc newWeb3*(
+    uri: string, getHeaders: GetJsonRpcRequestHeaders = nil):
+    Future[Web3] {.async.} =
   let u = parseUri(uri)
   var provider: RpcClient
   case u.scheme
   of "http", "https":
-    let p = newRpcHttpClient()
+    let p = newRpcHttpClient(getHeaders = getHeaders)
     await p.connect(uri)
     provider = p
   of "ws", "wss":
-    let p = newRpcWebSocketClient()
+    let p = newRpcWebSocketClient(getHeaders = getHeaders)
     await p.connect(uri)
     provider = p
   else: