[PATCH 4 of 5 postargs] httppeer: compute header names only once

[Martin von Zweigbergk]

For now, I've pushed up to here to the clowncopter, thanks.

On Fri, Mar 11, 2016 at 8:55 AM, Augie Fackler <raf at durin42.com> wrote:
> # HG changeset patch
> # User Augie Fackler <augie at google.com>
> # Date 1457715082 18000
> #      Fri Mar 11 11:51:22 2016 -0500
> # Node ID efcc8e438753cddf5af209ae812f77c2affead07
> # Parent  5355f92bff4a5527d7fdde189bc6d6a0c720095f
> # EXP-Topic batch
> httppeer: compute header names only once
>
> This also helps make the code a little more readable.
>
> diff --git a/mercurial/httppeer.py b/mercurial/httppeer.py
> --- a/mercurial/httppeer.py
> +++ b/mercurial/httppeer.py
> @@ -108,12 +108,12 @@ class httppeer(wireproto.wirepeer):
>                  headerfmt = 'X-HgArg-%s'
>                  contentlen = headersize - len(headerfmt % '000' + ': \r\n')
>                  headernum = 0
> +                varyheaders = []
>                  for i in xrange(0, len(encargs), contentlen):
>                      headernum += 1
>                      header = headerfmt % str(headernum)
>                      headers[header] = encargs[i:i + contentlen]
> -                varyheaders = [
> -                    headerfmt % str(h) for h in range(1, headernum + 1)]
> +                    varyheaders.append(header)
>                  headers['Vary'] = ','.join(varyheaders)
>              else:
>                  q += sorted(args.items())
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