ESAJPIP shouldn't require LEN field to work properly

[sfiruch]

The spec says this about the LEN request field in C.6.1:

This field specifies a restriction on the amount of data the client wants the server to send in response to this request. The unit shall be bytes. If not present, the server should send image data to the client until such point as all of the relevant data has been sent, a quality limit is reached (see C.6.2), or the response is interrupted by the arrival of a new request that does not include a Wait request field with a value of "yes" (see C.7.2). The client should use len=0 if it requires response headers and no response data.

ESAJPIP does not handle requests without LEN request fields properly.