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serving_versiondat_for_holotable.md

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Serving version.dat for holotable.exe

Serving in such a way that holotable can consume version.dat

  • Holotable requires that the Content-Type header is set.
  • Holotable requires that there is at least a single line after the Content-Length header.
< HTTP/1.1 200 OK
< Date: Sun, 07 Feb 2021 15:00:30 GMT
< Server: Apache/2.4.6 (CentOS) OpenSSL/1.0.2k-fips PHP/7.4.4
< Last-Modified: Mon, 21 Oct 2019 01:57:39 GMT
< ETag: "c6a-59562022f7377"
< Accept-Ranges: bytes
< Content-Length: 3178
< Content-Type: text/plain
<
  • Using apache2, we can force the Content-Type of the version.dat file to be text/plain with a config file:

/etc/apache2/conf-enabled/version_dat_content_type.conf

<Files "version.dat">
    ForceType text/plain
</Files>

Old hacks to enable Content-Type header not required

  • The version.dat file formerly used a hack to enable the Content-Type header where it placed 20 rows of 100 x m's at the bottom of the file.
  • When forcing the version.dat Content-Type to be text/plain using the server configuration override, the m's hack is not needed.
  • In reality, the m's hack does not work on modern Apache servers anyway, and might have been something specific to the legacy hosting provider.

Something about this extra stuff (including this line) weirdly causes the web server to send an extra "Content-Type:" line in the HTTP header, which is needed for Holotable to process this file correctly.  There has to be at least one line after the "Content-Length:" line in the header.
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  • Forcing the version.dat Content-Type IS REQUIRED, so do not exclude it.
  • If holotable is unable to check for updates, check the headers being returned by version.dat.
  • Holotable requires the Content-Length header to have a line after it, hence the requiement for Content-Type.

curl -v http://www.holotable.com:80/version.dat 1>/dev/null

< Content-Length: 3178
< Content-Type: text/plain