Looking at the following XRootD protocol code I can see that there is a protocol flag for each desired type of open including read:

[itctabuild02] xrdcl_tests (master) > vi /usr/include/xrootd/XProtocol/XProtocol.hh
...
enum XOpenRequestOption {
kXR_compress = 1, // also locate (return unique hosts)
kXR_delete = 2,
kXR_force = 4,
kXR_new = 8,
kXR_open_read= 16,
kXR_open_updt= 32,
kXR_async = 64,
kXR_refresh = 128, // also locate
kXR_mkpath = 256,
kXR_prefname = 256, // only locate
kXR_open_apnd= 512,
kXR_retstat = 1024,
kXR_replica = 2048,
kXR_posc = 4096,
kXR_nowait = 8192, // also locate
kXR_seqio =16384,
kXR_open_wrto=32768
};

In other words read on the wire is not represented by a 0 and from what I can tell 0 means nothing/none. Would you not be able to modify the XRootD server code to return an error to the client when there are leftover flags that its translation logic has not translated/consumed?

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