Issue #2223967 by jofitz, LKS90, AdamPS, sja112, shaktik, pminf, Berdir, mxr576, bmcclure, Manuel Garcia, naveenvalecha, Gogowitsch, andypost, alexpott, jonathanshaw, claudiu.cristea, greggles: Do not decode a contact message twice

Issue #2802403 by _Archy_, Berdir, rjay, catch, Tachion, jacktonkin, oriol_e9g, willwh, tameeshb, dawehner, dhansen, bmcclure, DeFr, david.gil, gagarine, plach: Combination of language negotiation and path aliasing can cause a corrupted route cache, 404s