geo302 — HTTP redirect proxy with healthcheck

geo302 is not an actual proxy, but a "pathfinder", which responses with 302 Found redirecting the HTTP-client to the actual URL. We use geolite2 geoIP database to determine user's location and select the most suitable upstream for this location. Client's IP is determined using proxy headers like X-FORWARDED-FOR with a fallback to the socket IP address. geo302 performs active health checks against all upstreams pinging them every few seconds.

The main use case of geo302 is redirecting a user to the closest server to minimize download time of large files.

Start

• Download geolite2 geoIP database
• Edit configuration file geo302.toml
• cargo run --release -- ./geo302.toml

Configuration

See an example of the configuration in geo302.toml.

Here we present a configuration where the optional entries have the default values:

```toml geolite2 = "" # .mmdb geolite2 file, get it from http://dev.maxmind.com host = "127.0.0.1:8080" # address to listen ipheaders = ["x-forwarded-for"] # optional headers to get client's IP, the first available is used ipheaderrecursive = true # true: get the first ip in the header, false: get the last one healthckeckinterval = 5 # healthcheck interval in seconds loglevel = "info" # logging level responseheaders = { } # a pairs of header key-values to add to the server reply

List of mirrors, both upstream and healthcheck keys are required

If requested URL is /, then redirect URL is /

[mirrors] somemirror = { upstream = "", healthcheck = "" } anothermirror = { upstream = "", healthcheck = "" }

List of locations:

- some subset of continents

- the mandatory "default" entry for the cases of unknown/unspecified client location

For each location the first healthy mirror is used

[continents]

Africa =

Asia =

Europe =

NorthAmerica =

Oceania =

SouthAmerica =

Antarctica =

default = ["", ""]

```

Limitations

geo302 is a failover and not a load-balancer. Currently geo302 doesn't support an upstream rotation for a single location, but you can specify a list of upstreams: the first available location will be used. If you need a load balancing to optimize a network usage, but do not need geoIP support, consider using another redirect proxy like rlb.

Locations are continent-level only. See https://github.com/hombit/geo302/issues/3 for country-level support

Only GET is supported. See https://github.com/hombit/geo302/issues/4 for HEAD support for health checks

All these limitations are not a part of the design and can be fixed in the future version. Feel free to open an issue or a PR.

License

MIT licensed.