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- Instructions for configuring Network & EMail options
-
- ====================================================
-
-
- There are currently 3 sections to the Network configuration window:
- Fetchers, Proxies, Miscellaneous. There are 3 sections in the
- EMail & News window: User details, E-Mail Gateways, News server
-
-
- Note that any changes are not effected until you click on OK, and
- they are NOT saved unless you click on Save Options.
-
-
- Fetchers
-
- ========
-
-
- This box contains 4 entries, HTTP FTP WAIS Gopher, the WAIS entry greyed
- out. These indicate whether ArcWeb will respond to URLs starting http: ftp:
- wais: gopher: respectively. If you do not have them selected, then you will
- most likely get a 'No fetcher for ...' error whenever you try to access
- anything non-local.
-
-
- So leave the HTTP box switched on always, and probably leave the FTP one
- switched on, unless you find that you are having trouble with ftp: URLs
- crashing the machine. Also leave the gopher one switch on.
-
-
- The reason why the WAIS option is greyed out and unselectable is because
- ArcWeb doesn't (yet!) know how to do that itself. It needs a proxy server
- to do it for it, which is explained in the next section...
-
-
- Proxies
-
- =======
-
-
- This section contains 4 proxy definitions, and 1 'No proxy' definition.
- Read the file WotIsProxy which was in the root of the ArcWeb archive.
- Follow the instructions at the bottom of that file in order to read
- the HTML version of my definition of a proxy.
-
-
- Each line in this section of the window represents a different URL scheme
- (HTTP, FTP, Gopher and WAIS). The large middle box contains the name of the
- proxy server, and the small box contains the TCP port number on which the
- proxy service is provided. The proxy is only used if the checkbox for that
- scheme is switched on. You probably want to leave all 4 of these switched
- on. If you are a Demon subscriber, then you want to ensure that all four
- host/port pairs are set to www-cache.demon.co.uk and 8080 ; UK academic
- community users want wwwcache.hensa.ac.uk in all the host boxes, and 8080 in
- the HTTP, FTP and Gopher ports, and 80 in the WAIS port.
-
-
- Whenever a request is issued, ArcWeb looks first at the proxy configuration
- to see if the proxy for that URL scheme is configured and enabled (* except
- see the No Proxy section below). If it is not, then it looks at the state of
- the 'Fetchers' section. If the scheme is not enabled in there either, then
- ArcWeb ignores the request and you will get a 'No fetcher for ...' error.
- But if the 'Fetchers' section does mark the scheme as enabled, then ArcWeb
- will communicate directly with the host who's name is given in the URL.
-
-
- If the proxy *is* enabled for the scheme, then ArcWeb talks to the configured
- proxy server for that scheme in preference to making a direct connection.
-
-
- (*) The 'No proxy' box is used to avoid proxying requests to 'nearby'
- machines (in network terms, not necessarily geographical distances).
- Usually, if the scheme is enabled in *both* the 'Proxies' section and the
- 'Fetchers' section of the window, then the proxy will 'win' and be used in
- preference to the direct connection method. However, if the host name used
- in the URL matches the No Proxy entry, then the proxy will not win, and a
- direct connection will be attempted.
-
-
- ArcWeb will compare the *end* bit of the hostname with the contents of the
- no proxy box in order to match the entries. So for example, if I set the no
- proxy to "ac.uk" and I ask for "http://www.ecs.soton.ac.uk/" then this is
- classified as a match, because the hostname ends "ac.uk". If I ask for
- "http://www.demon.co.uk/" then this does not match. Similarly, if I ask for
- "http://lilac.ukansas.edu/" (I don't know if this exists or not - it is only
- an example) then this does *NOT* match, despite the ac.uk in the middle.
-
-
- You can have a comma seperated list of match domains in the no proxy box,
- eg. ac.uk,acorn.co.uk which will cause addresses to be compared with
- "ac.uk" and then with "acorn.co.uk". An address has to not match any of
- these entries in order to be proxied.
-
-
- Miscellaneous
-
- =============
-
-
- The top 2 options in this section regard the actions that ArcWeb
- should take at particular points of its execution.
-
-
- If the 'Retain authentication' option is *OFF* (as recommended), then the
- cache of user name/passwords used during the current session will be DELETED
- as a security precaution. If the option in *ON*, then the data is retained
- in the cache permanently (until you switch the option off and quit ArcWeb, or
- manually delete the !WebCache.Data.Auth_DB file). If you are the only user
- of your machine and it is relatively physically secure, then there is no harm
- of switching on this option. For example, you can access the Clan Acorn
- pages (if you are a member) and once you have entered the password then that
- will be remembered in future sessions.
-
-
- If the 'Ask for confirmation when using unofficial ports' is switched *ON*
- (as recommended), then any attempt to use a particular scheme on a different
- port from its well-known port will be intercepted and you will be prompted to
- confirm the fetch. For example, the gopher protocol runs on TCP port 70. If
- you find a URL such as "gopher://some.host.name:79/0hello" then this will be
- trapped, since port 79 is not the standard gopher port (it is the 'finger'
- port actually) and you will be asked to confirm that the connection should
- go ahead. The result of continuing this fetch (in this example) will be to
- actually perform the equivalent of 'finger hello@some.host.name' and won't
- have anything to do with gopher at all. The results of talking to a server
- using the wrong protocol are at best undefined.
-
-
- NOTE: since many people who run http servers (under UNIX) do not have 'root'
- user access, they cannot run the server on the well-known port for http
- (which is 80). This is the reason you see http servers run on port 8080,
- 8001 and others. For this reason, http URLs are *never* trapped in this
- manner by ArcWeb.
-
-
- The second two options control some extra information that ArcWeb can
- provide to remote servers.
-
-
- Send Referer information to HTTP servers refers to a special header which
- ArcWeb sends to the server to tell it the URL of the page you found the
- link to the page you are fetching. (It is never sent if the page was
- local:, or was typed in directly).
-
-
- Send e-mail id to HTTP servers refers to the ability to send your e-mail
- id with the request. There's not really anu harm in having this switched
- on, unless you paranoid about security and people knowing what you are
- looking at.
-
-
- EMail & News Configuration
-
- ==========================
-
-
- This window contains the information which ArcWeb requires in order to
- service mailto: URLs and some news: or nntp: URLs. Note that this will NOT
- download your mail or news from your provider as it is not a 'transport' for
- any other application you might have. The gateways section will disappear as
- soon as suitable support is built into other applications.
-
-
- User Details
-
- ============
-
-
- You should enter you full name in the Name box, and your complete e-mail
- address in the Address box. This will enable services which are provided
- by submitting forms via e-mail to respond to you! They are also used if
- you send e-mail with ArcWeb.
-
-
- E-Mail gateways
-
- ===============
-
-
- You should enable the second option "Smarthost mail gateway", and enter
- the hostname of your smart host mail gateway. This is the machine which
- will accept any mail FROM you to anyone else. eg. Demon users can use
- post.demon.co.uk as a smarthost.
-
-
-
- MX mail delivery isn't implemented currently, hence it is greyed out.
- This will usually be more efficient (the message will get to its
- destination quicker), but may take longer to send if the MX host is
- a long way away.
-
-
- If you follow a 'mailto:' URL link, then ArcWeb will create a small text file
- and open it in your current text file editor. Once you have completed the
- e-mail, you should 'Save' the document *directly* from the editor onto
- ArcWeb's icon bar icon, and it will then be sent. This is a *kludgy* way of
- sending mail and much better support will be provided in the future by proper
- e-mail programs. What You See in the editor is What Is Sent to the mail
- server, so don't mess around with the headers except to change the subject
- line. In particular, don't move the To: line because ArcWeb relies on
- finding it there. There is *no* concept of adding taglines, signatures or
- anything.
-
-
- News Server
-
- ===========
-
-
- The 'News Server' big box contains the name of a news server which is willing
- to talk to you. If you have the News Server icon switched on, then ArcWeb
- will attempt to retrieve specific articles from the given server. Note that
- this is, again, a *kludge* so that specific articles can be read. It does
- *NOT* provide any kind of menu of articles, threading etc. (yet!)
-
-
- --
-
- Stewart Brodie
-
- 10th December 1996
-
-