Hi Willy, This trick is great but I need to do some more complicate to encode doubles to string, is there a way that I can implement geohash_encode?
http-request add-header x-foo %[geohash_encode(header1,header2)] Geohash string defines a square on the globe and with a few squares you can define a region like a city or a state, so is easier to match these few strings and define what is the closest server to the client's location, because latitude and longitude inside a square has the same string prefix. Tks in advance, Marcelo Milhomem Enviada do meu iPhone > Em 06/09/2014, às 04:50, Willy Tarreau <[email protected]> escreveu: > >> On Sat, Sep 06, 2014 at 12:20:48AM -0300, Marcelo Milhomem wrote: >> Today we can balance requests by user's location using a string geohash >> header and an ACL with hdr_beg(). We now have some request that only have >> the Latitude and Longitude from GPS but is too hard to match against it, we >> know that these numbers can be converted to geohash like this library do >> https://github.com/simplegeo/libgeohash/blob/master/geohash.c >> Is there a way that we can use two headers values(double type) as >> parameters to a geohash function and match the result(string type) using >> hdr_beg()? > > I don't know how this thing works, but there's a trick to combine multiple > headers into one. You can use the add-header action of the http-request > ruleset, and build a new header from the two other ones. Example : > > http-request add-header x-foo %[hdr(header1)]%[hdr(header2)] > > Then you can balance on hdr(x-foo). I don't know if that can help you here. > > Willy >
