XrdHttp should have better handling of the `Connection` header. Without it, HTTP 1.0 clients may timeout when trying to download files.
For example, using the venerable `ab` ("ApacheBench") utility with the following invocation:
```
ab -n1 http://host.example.com/foo
```
it will hang and fail the connection because it sets `Connection: close` in the request and waits for the TCP connection to close before considering the request complete (note: if you are trying to reproduce, it will only do this for a `20x` response).
My reading of things is that the response behavior should be:
* If the request asks to keep the connection alive, keep it alive.
* If the request asks to close the connection, close it.
* If the request doesn't provide a `Connection` header, it should be kept alive as we respond with `HTTP 1.1` (the default for that version).
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