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Simplistically, you may think of a proxy as an application level firewall In the case of Web proxies, it can serve to direct, redirect, or limit access through the proxy to servers and specific URLs Although the proxy may be placed in parallel with the firewall, our preference is to put it behind the firewall Remember, we may use several firewalls in parallel to handle the traffic load Extreme care must be taken to make sure that you have a consistent rule set across all firewalls

Another part of the battery selection process is selecting the proper wire sizes between the batteries and the motors The electrical wires must withstand the current requirements without overheating The wire s current rating is determined by the gauge of the wire and the type and thickness of the insulation around the wires If the wire size is too small for the amount of current passing through it, the wire will heat up to the point where the insulation will melt and in the worse case, the wire may melt Table 5-3 shows the conservative American Wire Gauge (AWG) values for various maximum currents through copper wire This table is a good starting point for selecting the appropriate wire sizes for your robot The figures in Table 5-3 are conservative and considered safe for normal home use But some robot builders use #12 wires for 200-plus amps, #10 for 350-plus amps, #8 for 500-plus amps, and #4 for 1,000-plus amps (These are peak amp draws; average amp draws are much lower) The key is to use the high-temperature insulation

Figure 6-8

There are two kinds of proxies Your company uses a forward proxy to limit where your employees are permitted to surf ISPs use proxies to limit the options that their members have They don t limit destination Web sites (although they could exclude known porn sites), but they limit their members to HTTP and FTP This limits some of their hacking options Also, the queries to the remote Web sites appear to be coming from the proxy instead of from the individuals user s terminal because the proxy masks the user address by replacing it with its own

Current 13 amps 18 amps 20 amps 28 amps 38 amps 53 amps 78 amps 105 amps 142 amps 196 amps 266 amps

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A report with products in the series and time along the bottom axis The measure used is placed only in the background

TABLE 5-3

A reverse proxy is used as a front-end for a Web server (A large server farm would implement an array of proxies) Requests to wwwanywherecom are routed to our proxy which forwards the request to server content server (keeper of the real Web page) The surfer thinks it is talking to server www for all requests This makes it nice for the Webmaster, who is in the process of replacing content server with bigger server All of our user s links remain the same; we just change where the proxy points As above, we can limit which URLs the proxy permits So we could have two Web servers, but only the content of one is visible to the outside world The proxy (both forward and reverse) also helps reduce network traffic and content server load The proxy caches every requested Web page The next request to that same server, whether it is from the same or a different source, is satisfied out of cache without having to go back to the content server If the ISP has a proxy array, it will eventually contain all the popular Web pages, thus minimizing the number of requests sent out across the Internet The reverse proxies at the content provider s location also cache popular pages The rules as to how much to cache and when to go back to the content server for the latest version of the page may be set up in the proxy server In fact, at a large site with a large, the popular pages are downloaded into the proxies at low traffic time, and they serve the Web requesters This improves site reliability and flexibility Figure 31-4 shows a typical proxy array behind a firewall Each of the proxies directly connected to the firewall provides an interface to one or more servers, usually handling a given subject The proxy in front of the other proxies has servers of related subjects, and.