cdp: add mimeType and charset to Network.Response

src/browser/mime.zig

@@ -53,6 +53,18 @@ pub const Mime = struct {
         other: struct { type: []const u8, sub_type: []const u8 },
     };
 
+    pub fn contentTypeString(mime: *const Mime) [:0]const u8 {
+        return switch (mime.content_type) {
+            .text_xml => "text/xml",
+            .text_html => "text/html",
+            .text_javascript => "application/javascript",
+            .text_plain => "text/plain",
+            .text_css => "text/css",
+            .application_json => "application/json",
+            else => "",
+        };
+    }
+
     /// Returns the null-terminated charset value.
     pub fn charsetString(mime: *const Mime) [:0]const u8 {
         return @ptrCast(&mime.charset);

src/cdp/domains/network.zig

@@ -22,6 +22,7 @@ const Allocator = std.mem.Allocator;
 const CdpStorage = @import("storage.zig");
 const Transfer = @import("../../http/Client.zig").Transfer;
 const Notification = @import("../../notification.zig").Notification;
+const Mime = @import("../../browser/mime.zig").Mime;
 
 pub fn processMessage(cmd: anytype) !void {
     const action = std.meta.stringToEnum(enum {
@@ -392,6 +393,20 @@ const TransferAsResponseWriter = struct {
             try jws.write(@as(std.http.Status, @enumFromInt(status)).phrase() orelse "Unknown");
         }
 
+        {
+            const mime: Mime = blk: {
+                if (transfer.response_header.?.contentType()) |ct| {
+                    break :blk try Mime.parse(ct);
+                }
+                break :blk .unknown;
+            };
+
+            try jws.objectField("mimeType");
+            try jws.write(mime.contentTypeString());
+            try jws.objectField("charset");
+            try jws.write(mime.charsetString()[0..]);
+        }
+
         {
             // chromedp doesn't like having duplicate header names. It's pretty
             // common to get these from a server (e.g. for Cache-Control), but