From f3949d9f2fbd93ce27fc2bcb34e6317829078220 Mon Sep 17 00:00:00 2001
From: Irakli Safareli <i.safareli@gmail.com>
Date: Tue, 8 May 2018 16:37:08 +0200
Subject: [PATCH 1/2] fix _sendAsync canceler

HttpProvider.prototype.sendAsync returns undefined so we can't cancel it.
https://github.com/ethereum/web3.js/blob/develop/lib/web3/httpprovider.js#L114-L141
---
 src/Network/Ethereum/Web3/JsonRPC.js | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/Network/Ethereum/Web3/JsonRPC.js b/src/Network/Ethereum/Web3/JsonRPC.js
index 7d60cb3e..62809b00 100644
--- a/src/Network/Ethereum/Web3/JsonRPC.js
+++ b/src/Network/Ethereum/Web3/JsonRPC.js
@@ -4,15 +4,18 @@
 exports._sendAsync = function (provider) {
     return function (request) {
         return function(onError, onSuccess) {
-            var cancel = provider.sendAsync(request, function(err, succ) {
-                if (err) {
+            var canceled = false;
+            provider.sendAsync(request, function(err, succ) {
+                if (canceled) {
+                    return;
+                } else if (err) {
                     onError(err);
                 } else {
                     onSuccess(succ);
                 }
             });
             return function (cancelError, onCancelerError, onCancelerSuccess) {
-                cancel();
+                canceled = true;
                 onCancelerSuccess();
             };
         };

From 38158bdc99ce9acd02e08ef5f1ddc6366c704b12 Mon Sep 17 00:00:00 2001
From: Irakli Safareli <i.safareli@gmail.com>
Date: Tue, 8 May 2018 17:41:09 +0200
Subject: [PATCH 2/2] no need for canceling flag

---
 src/Network/Ethereum/Web3/JsonRPC.js | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/src/Network/Ethereum/Web3/JsonRPC.js b/src/Network/Ethereum/Web3/JsonRPC.js
index 62809b00..54c20920 100644
--- a/src/Network/Ethereum/Web3/JsonRPC.js
+++ b/src/Network/Ethereum/Web3/JsonRPC.js
@@ -4,18 +4,14 @@
 exports._sendAsync = function (provider) {
     return function (request) {
         return function(onError, onSuccess) {
-            var canceled = false;
             provider.sendAsync(request, function(err, succ) {
-                if (canceled) {
-                    return;
-                } else if (err) {
+                if (err) {
                     onError(err);
                 } else {
                     onSuccess(succ);
                 }
             });
             return function (cancelError, onCancelerError, onCancelerSuccess) {
-                canceled = true;
                 onCancelerSuccess();
             };
         };