InvalidOperationException: UnityWebRequest has already been sent; cannot modify the download handler
时间: 2024-02-02 09:05:32 浏览: 45
这个错误通常是由于在发送UnityWebRequest之后试图更改下载处理程序而导致的。UnityWebRequest在发送后就不能再更改下载处理程序了。如果你需要更改下载处理程序,你需要在发送UnityWebRequest之前更改它。你可以在创建UnityWebRequest对象时指定下载处理程序,例如:
```
UnityWebRequest www = new UnityWebRequest(url);
DownloadHandlerBuffer downloadHandler = new DownloadHandlerBuffer();
www.downloadHandler = downloadHandler;
yield return www.SendWebRequest();
```
这将在创建UnityWebRequest对象时设置下载处理程序。确保在发送请求之前设置所有需要更改的下载处理程序。
相关问题
InvalidOperationException: UnityWebRequest has already been sent and its request headers cannot be altered
这个错误通常是由于在发送UnityWebRequest之后试图更改请求头而导致的。UnityWebRequest在发送后就不能再更改请求头了。如果你需要更改请求头,你需要在发送UnityWebRequest之前更改它们。你可以在发送请求之前使用SetRequestHeader方法来设置请求头。例如,使用以下代码来设置请求头:
```
UnityWebRequest www = UnityWebRequest.Get(url);
www.SetRequestHeader("Content-Type", "application/json");
yield return www.SendWebRequest();
```
这将在发送请求之前设置Content-Type请求头。确保在发送请求之前设置所有需要更改的请求头。
InvalidOperationException: Cannot Open when State is Open.
The error message "InvalidOperationException: Cannot Open when State is Open" typically occurs when you try to open a connection to a database that is already open.
To fix this issue, you should first check if the connection is already open before attempting to open it again. You can do this by calling the "State" property of the connection object, which will return the current state of the connection.
For example, you can check if the connection is open like this:
```
if (connection.State == ConnectionState.Open)
{
// Connection is already open, do not attempt to open again
}
else
{
// Connection is not open, open it now
connection.Open();
}
```
Make sure to always close the connection when you are finished using it, to avoid this issue in the future.