Update headers code

v2/internal/frontend/desktop/windows/go-webview2/pkg/edge/ICoreWebView2HttpRequestHeaders.go

@@ -7,6 +7,10 @@ import (
 	"golang.org/x/sys/windows"
 )
 
+const (
+	ERROR_ELEMENT_NOT_FOUND syscall.Errno = 0x80070490
+)
+
 type _ICoreWebView2HttpRequestHeadersVtbl struct {
 	_IUnknownVtbl
 	GetHeader    ComProc
@@ -25,6 +29,58 @@ func (i *ICoreWebView2HttpRequestHeaders) Release() error {
 	return i.vtbl.CallRelease(unsafe.Pointer(i))
 }
 
+// GetHeader returns the value of the specified header. If the header is not found
+// ERROR_ELEMENT_NOT_FOUND is returned as error.
+func (i *ICoreWebView2HttpRequestHeaders) GetHeader(name string) (string, error) {
+	_name, err := windows.UTF16PtrFromString(name)
+	if err != nil {
+		return "", nil
+	}
+
+	var _value *uint16
+	res, _, err := i.vtbl.GetHeader.Call(
+		uintptr(unsafe.Pointer(i)),
+		uintptr(unsafe.Pointer(_name)),
+		uintptr(unsafe.Pointer(&_value)),
+	)
+	if err != windows.ERROR_SUCCESS {
+		return "", err
+	}
+	if windows.Handle(res) != windows.S_OK {
+		return "", syscall.Errno(res)
+	}
+
+	value := windows.UTF16PtrToString(_value)
+	windows.CoTaskMemFree(unsafe.Pointer(_value))
+	return value, nil
+}
+
+// SetHeader sets the specified header to the value.
+func (i *ICoreWebView2HttpRequestHeaders) SetHeader(name, value string) error {
+	_name, err := windows.UTF16PtrFromString(name)
+	if err != nil {
+		return nil
+	}
+
+	_value, err := windows.UTF16PtrFromString(value)
+	if err != nil {
+		return nil
+	}
+
+	res, _, err := i.vtbl.SetHeader.Call(
+		uintptr(unsafe.Pointer(i)),
+		uintptr(unsafe.Pointer(_name)),
+		uintptr(unsafe.Pointer(_value)),
+	)
+	if err != windows.ERROR_SUCCESS {
+		return err
+	}
+	if windows.Handle(res) != windows.S_OK {
+		return syscall.Errno(res)
+	}
+	return nil
+}
+
 // GetIterator returns an iterator over the collection of request headers. Make sure to call
 // Release on the returned Object after finished using it.
 func (i *ICoreWebView2HttpRequestHeaders) GetIterator() (*ICoreWebView2HttpHeadersCollectionIterator, error) {