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-
- Help on Proxies and how to use them
- ===================================
-
- The best guide to proxies may be found at:
-
- http://www.demon.co.uk:8080/
-
-
- However, here is a message taken from demon.ip.support.archimedes ...
-
- In message <19950605.222342.63@sitex.demon.co.uk> Neil Tarrant wrote:
-
- A proxy machine is an HTTP server that 'passes on' requests to other sites.
- It requests the document on your behalf.
-
- At first this may seem a little pointless, but after using one for a while
- you'll really appreciate the benefits. Most internet WWW users browse
- pages in the United States. Going over to the States each time you want to
- read a HTTP doc is sluggish (to say the least). A proxy HOLDS recent copies
- of *popular* documents and hence can often give a **MUCH** faster response. A
- good example of this is 'http://www.playboy.com/' which is a *very* popular
- home page. Accessing this without the proxy is very slow, but with the proxy,
- response is *very* fast.
-
- HTTP proxy is also very useful when browsing European sites. Not many
- people realise that requests to Europe USUALLY go via the US, which adds
- a hell of an overhead to the request time (it's often faster accessing
- Australia).
-
- The other important use of proxy machines (well some anyway) is that they
- provide non-HTTP resource conversion. For example, gopher requests return
- gibberish if fetched directly, but a proxy will translate the gibberish
- into a nicely laid out HTTP document. The same is true of FTP (etc), which
- is tricky to provide via a local client fetcher.
-
- Therefore an application such as WebGopher, can provide HTTP, gopher, ftp
- and others, without much programming. [ArcWebTCP will handle HTTP and FTP
- requests itself, and use the resource conversion utilities for gopher and
- WAIS. Ed.]
-
- Note, however, WebGopher can do (and only does) direct gopher fetching,
- 'coz it's nicer', but the others can be done via a different proxy. FTP,
- for example, is ONLY handled via the proxy (it took me all of 15 minutes
- to add FTP support this way).
-
- Direct fetching is usually more efficient for non-HTTP protocols, as it's
- mainly for HTTP (that's where most benefits will be gained).
-
- [If you want to use proxies, and you are a Demon customer, then use,
- www.demon.co.uk on port 80 as your HTTP proxy and also for FTP, gopher and
- WAIS. If you in the UK academic community then use wwwcache.hensa.ac.uk on
- port 8080 except WAIS which is on port 80 on wwwcache.hensa.ac.uk Ed.].
-
- NOTE: It is considered 'rude' to use an external proxy UNLESS you have
- no viable alternative (ie use demon instead of hensa for HTTP), as it
- places undesirable strain on the overloaded general proxy machines.
-
- I hope this clears up the confusion many new users seem to have regarding
- proxy machine usage. :-)
-
- [For more details on how ArcWebTCP handles proxies, load ArcWeb and click
- on the icon bar icon to open the welcome page. Then follow the link to
- the User Manual and then follow the 'Proxy' link. Ed.]
-
- --------------------
- Neil Tarrant
- (Modifications by S.Brodie marked as [Ed.])
-