diff --git a/util/net/http_transport_mac.mm b/util/net/http_transport_mac.mm
index dd28e0242..bfd844b19 100644
--- a/util/net/http_transport_mac.mm
+++ b/util/net/http_transport_mac.mm
@@ -282,14 +282,26 @@ static bool ExecuteProxyRequest(NSMutableURLRequest* request,
     NSString* hostNS = base::SysUTF8ToNSString(host);
     NSNumber* proxy_port = @(std::stoi(port));
 
-    NSDictionary* proxyDict = @{
-      (__bridge id)kCFNetworkProxiesHTTPEnable : @YES,
-      (__bridge id)kCFNetworkProxiesHTTPPort : proxy_port,
-      (__bridge id)kCFNetworkProxiesHTTPProxy : hostNS,
-      @"HTTPSEnable" : @YES,
-      @"HTTPSPort" : proxy_port,
-      @"HTTPSProxy" : hostNS,
-    };
+    NSDictionary* proxyDict;
+
+    if ([schemeNS isEqualToString:@"http"] || [schemeNS isEqualToString:@"https"]) {
+        // The keys in this dictionary refer to the target URL,
+        // whereas `schemeNS` refers to the proxy URL.
+        proxyDict = @{
+          @"HTTPEnable" : @YES,
+          @"HTTPPort" : proxy_port,
+          @"HTTPProxy" : hostNS,
+          @"HTTPSEnable" : @YES,
+          @"HTTPSPort" : proxy_port,
+          @"HTTPSProxy" : hostNS
+        };
+    } else if ([schemeNS isEqualToString:@"socks5"]) {
+        proxyDict = @{
+          @"SOCKSEnable" : @YES,
+          @"SOCKSPort" : proxy_port,
+          @"SOCKSProxy" : hostNS
+        };
+    }
     sessionConfig.connectionProxyDictionary = proxyDict;
     NSURLSession* session =
         [NSURLSession sessionWithConfiguration:sessionConfig];
diff --git a/util/net/url.cc b/util/net/url.cc
index 9d037bdcd..0e819fae9 100644
--- a/util/net/url.cc
+++ b/util/net/url.cc
@@ -53,6 +53,7 @@ bool CrackURL(const std::string& url,
   size_t host_start;
   static constexpr const char kHttp[] = "http://";
   static constexpr const char kHttps[] = "https://";
+  static constexpr const char kSocks[] = "socks5://";
   if (url.compare(0, strlen(kHttp), kHttp) == 0) {
     result_scheme = "http";
     result_port = "80";
@@ -61,8 +62,12 @@ bool CrackURL(const std::string& url,
     result_scheme = "https";
     result_port = "443";
     host_start = strlen(kHttps);
+  } else if (url.compare(0, strlen(kSocks), kSocks) == 0) {
+    result_scheme = "socks5";
+    result_port = "1080";
+    host_start = strlen(kSocks);
   } else {
-    LOG(ERROR) << "expecting http or https";
+    LOG(ERROR) << "expecting http, https or socks5";
     return false;
   }