Ah, I see the problem. In XrdHttpReq.cc, we have this:

    // Trim left
    while (!isalnum(*val) || (!*val)) val++;

I think that code means to do isblank as the first character of my destination is not alphanumeric. Hence, with this header:

Destination: -

The value of the second argument to assign in the following line is -1:

      destination.assign(val, line+len-val);

resulting in a SIGABRT.

In general, we should also make sure that val doesn't go past line+len in our while loop.

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