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A.5 Port Numbers
Recall that interception caching (Chapter 5) usually diverts only port 80 connections. However, some HTTP servers use other ports for various reasons. The IRCache data in Table A-9 shows that only 0.3% of HTTP traffic is not on port 80. However, this is an underestimation if we assume that many of the IRCache clients use interception proxying to begin with. The non-port 80 requests won't be intercepted and hence won't reach these caches.
Table A-9. Server Port Numbers (IRCache Data)
Port | % Servers | % Requests | % Bytes |
80 | 99.705 | 99.610 | 99.619 |
8080 | 0.003 | 0.088 | 0.094 |
8000 | 0.003 | 0.039 | 0.040 |
All others | 0.289 | 0.262 | 0.247 |
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