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../../exercises/http.rst:31
English
The `ipvfoo <https://code.google.com/p/ipvfoo/>`_ extension on google chrome allows the user to visually detect whether a website is using IPv6 and IPv4, but also to see which web sites have been contacted when rendering a given web page. Some websites are distributed over several dozens of different servers. Can you find one ?
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../../exercises/http.rst:33
English
Some websites are reachable over both IPv4 and IPv6 while others are only reachable over IPv4 [#fv6only]_. You can use the `-6` (resp. `-4`) option to force curl_ to only use IPv6 (resp. IPv4). Verify that `www.computer-networking.info` is reachable over IPv6 and IPv4 and then check whether your university website already supports IPv6.
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../../exercises/http.rst:35
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curl_ supports a huge number of options and parameters that are described in its `man page <https://curl.haxx.se/docs/manpage.html>`_ Some of them allow you to force the utilization of a specific version of HTTP. These include `--http0.9`, `--http1.0`, `--http1.1` and `--http2`. Using the latter, verify whether your favorite website supports HTTP/2.0.
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../../exercises/http.rst:37
English
As for the DNS, besides using software tools that implement the HTTP protocols, it can also be useful to analyze packet traces with wireshark_ . The exercises below contain simple packet traces collected with different versions of the HTTP protocol.
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../../exercises/http.rst:51
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The minimum command sent to a HTTP server is `GET / HTTP/1.0` followed by CRLF and a blank line.
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../../exercises/http.rst:53
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This syllabus is now hosted on a web server using HTTPS (port 443) instead of HTTP (port 80).
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../../exercises/http.rst:55
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The list of available language tags can be found at http://www.iana.org/assignments/language-subtag-registry. Versions in other formats are available at http://www.langtag.net/registries.html. Additional information about the support of multiple languages in Internet protocols may be found in rfc5646_.
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../../exercises/http.rst:57
English
There are probably very few websites that only support IPv6 and not IPv4. If you find one, let us know by submitting a pull-request to change this exercise.
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