MCHU-709 — Preview block too large
The ICAP clients and servers can use so called Preview function, when at first only a part of the document is sent to the server, the server makes a decision and responds by the 100 Continue, or some error response. The size of the preview block is recommended by the server via the OPTIONS request response and client should respect it. The actual preview size is announced by the client and must not be exceeded.
This message reports the situation when a client did not respect server recommendation, or its own announcement and sent more data.
Data cannot be decoded and the particular request fails.
Try to check the client configuration whether it is not possible to forbide him the preview usage.