A problem in sending extra data and store them

Hi.
I have a problem with my self-hosted sentry and I posted it in this topic
When I want to set a large data as extra data in the context, Some fields will be missed in the server. I used Wireshark and get the specific packet and saw that the whole data is true, but in sentry, I didn’t have the whole of data
Can anyone help me to pass through this problem?
Thanks