use CURLOPT_COOKIE to set cookies

src/http/Client.zig

@@ -319,6 +319,14 @@ fn makeRequest(self: *Client, handle: *Handle, transfer: *Transfer) !void {
         var header_list = req.headers;
         try conn.secretHeaders(&header_list); // Add headers that must be hidden from intercepts
         try errorCheck(c.curl_easy_setopt(easy, c.CURLOPT_HTTPHEADER, header_list.headers));
+
+        // Add cookies.
+        // Clear cookies from Curl's engine.
+        try errorCheck(c.curl_easy_setopt(easy, c.CURLOPT_COOKIELIST, "ALL"));
+        if (header_list.cookies) |cookies| {
+            try errorCheck(c.curl_easy_setopt(easy, c.CURLOPT_COOKIE, cookies));
+        }
+
         try errorCheck(c.curl_easy_setopt(easy, c.CURLOPT_PRIVATE, transfer));
     }
 
@@ -506,12 +514,11 @@ pub const RequestCookie = struct {
             .is_http = self.is_http,
             .is_navigation = self.is_navigation,
             .origin_uri = self.origin,
-            .prefix = "Cookie: ",
         });
 
         if (arr.items.len > 0) {
             try arr.append(temp, 0); //null terminate
-            try headers.add(@ptrCast(arr.items.ptr));
+            headers.cookies = @ptrCast(arr.items.ptr);
         }
     }
 };

src/http/Http.zig

@@ -204,6 +204,13 @@ pub const Connection = struct {
         try self.secretHeaders(&header_list);
         try errorCheck(c.curl_easy_setopt(easy, c.CURLOPT_HTTPHEADER, header_list.headers));
 
+        // Add cookies.
+        // Clear cookies from Curl's engine.
+        try errorCheck(c.curl_easy_setopt(easy, c.CURLOPT_COOKIELIST, "ALL"));
+        if (header_list.cookies) |cookies| {
+            try errorCheck(c.curl_easy_setopt(easy, c.CURLOPT_COOKIE, cookies));
+        }
+
         try errorCheck(c.curl_easy_perform(easy));
         var http_code: c_long = undefined;
         try errorCheck(c.curl_easy_getinfo(easy, c.CURLINFO_RESPONSE_CODE, &http_code));
@@ -216,11 +223,12 @@ pub const Connection = struct {
 
 pub const Headers = struct {
     headers: *c.curl_slist,
+    cookies: ?[*c]const u8,
 
     pub fn init() !Headers {
         const header_list = c.curl_slist_append(null, "User-Agent: Lightpanda/1.0");
         if (header_list == null) return error.OutOfMemory;
-        return .{ .headers = header_list };
+        return .{ .headers = header_list, .cookies = null };
     }
 
     pub fn deinit(self: *const Headers) void {
@@ -245,6 +253,10 @@ pub const Headers = struct {
             list.putAssumeCapacity(header.name, header.value);
             current = node.*.next;
         }
+        // special case for cookies
+        if (self.cookies) |v| {
+            list.putAssumeCapacity("Cookie", std.mem.span(@as([*:0]const u8, @ptrCast(v))));
+        }
         return list;
     }
 
@@ -264,6 +276,10 @@ pub const Headers = struct {
             num += 1;
             current = node.*.next;
         }
+        // special case for cookies
+        if (self.cookies != null) {
+            num += 1;
+        }
         return num;
     }
 };