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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