diff --git a/lib/std/Uri.zig b/lib/std/Uri.zig
index adc8a675e3..a6a766e9f4 100644
--- a/lib/std/Uri.zig
+++ b/lib/std/Uri.zig
@@ -176,7 +176,7 @@ pub fn parseWithoutScheme(text: []const u8) ParseError!Uri {
 
         var end_of_host: usize = authority.len;
 
-        if (authority[start_of_host] == '[') { // IPv6
+        if (authority.len > start_of_host and authority[start_of_host] == '[') { // IPv6
             end_of_host = std.mem.lastIndexOf(u8, authority, "]") orelse return error.InvalidFormat;
             end_of_host += 1;
 
diff --git a/lib/std/http/Client.zig b/lib/std/http/Client.zig
index 478e3e8369..74afe53a3e 100644
--- a/lib/std/http/Client.zig
+++ b/lib/std/http/Client.zig
@@ -1046,9 +1046,15 @@ pub fn loadDefaultProxies(client: *Client) !void {
             break :http;
         defer client.allocator.free(content);
 
-        const uri = try Uri.parse(content);
+        const uri = Uri.parse(content) catch
+            Uri.parseWithoutScheme(content) catch
+            break :http;
+
+        const protocol = if (uri.scheme.len == 0)
+            .plain // No scheme, assume http://
+        else
+            protocol_map.get(uri.scheme) orelse break :http; // Unknown scheme, ignore
 
-        const protocol = protocol_map.get(uri.scheme) orelse break :http; // Unknown scheme, ignore
         const host = if (uri.host) |host| try client.allocator.dupe(u8, host) else break :http; // Missing host, ignore
         client.http_proxy = .{
             .allocator = client.allocator,
@@ -1063,16 +1069,16 @@ pub fn loadDefaultProxies(client: *Client) !void {
         };
 
         if (uri.user != null and uri.password != null) {
-            const prefix_len = "Basic ".len;
+            const prefix = "Basic ";
 
             const unencoded = try std.fmt.allocPrint(client.allocator, "{s}:{s}", .{ uri.user.?, uri.password.? });
             defer client.allocator.free(unencoded);
 
-            const buffer = try client.allocator.alloc(u8, std.base64.standard.Encoder.calcSize(unencoded.len) + prefix_len);
+            const buffer = try client.allocator.alloc(u8, std.base64.standard.Encoder.calcSize(unencoded.len) + prefix.len);
             defer client.allocator.free(buffer);
 
-            const result = std.base64.standard.Encoder.encode(buffer[prefix_len..], unencoded);
-            @memcpy(buffer[0..prefix_len], "Basic ");
+            const result = std.base64.standard.Encoder.encode(buffer[prefix.len..], unencoded);
+            @memcpy(buffer[0..prefix.len], prefix);
 
             try client.http_proxy.?.headers.append("proxy-authorization", result);
         }
@@ -1091,11 +1097,17 @@ pub fn loadDefaultProxies(client: *Client) !void {
             break :https;
         defer client.allocator.free(content);
 
-        const uri = try Uri.parse(content);
+        const uri = Uri.parse(content) catch
+            Uri.parseWithoutScheme(content) catch
+            break :https;
+
+        const protocol = if (uri.scheme.len == 0)
+            .plain // No scheme, assume http://
+        else
+            protocol_map.get(uri.scheme) orelse break :https; // Unknown scheme, ignore
 
-        const protocol = protocol_map.get(uri.scheme) orelse break :https; // Unknown scheme, ignore
         const host = if (uri.host) |host| try client.allocator.dupe(u8, host) else break :https; // Missing host, ignore
-        client.http_proxy = .{
+        client.https_proxy = .{
             .allocator = client.allocator,
             .headers = .{ .allocator = client.allocator },
 
@@ -1108,16 +1120,16 @@ pub fn loadDefaultProxies(client: *Client) !void {
         };
 
         if (uri.user != null and uri.password != null) {
-            const prefix_len = "Basic ".len;
+            const prefix = "Basic ";
 
             const unencoded = try std.fmt.allocPrint(client.allocator, "{s}:{s}", .{ uri.user.?, uri.password.? });
             defer client.allocator.free(unencoded);
 
-            const buffer = try client.allocator.alloc(u8, std.base64.standard.Encoder.calcSize(unencoded.len) + prefix_len);
+            const buffer = try client.allocator.alloc(u8, std.base64.standard.Encoder.calcSize(unencoded.len) + prefix.len);
             defer client.allocator.free(buffer);
 
-            const result = std.base64.standard.Encoder.encode(buffer[prefix_len..], unencoded);
-            @memcpy(buffer[0..prefix_len], "Basic ");
+            const result = std.base64.standard.Encoder.encode(buffer[prefix.len..], unencoded);
+            @memcpy(buffer[0..prefix.len], prefix);
 
             try client.https_proxy.?.headers.append("proxy-authorization", result);
         }