osrm-backend: TooBig error code with no message.

I read #5022 but it looks like I’m not running into the same problem. I also receive the TooBig error code, but no message, here’s the returned data:

{  
   "sources":null,
   "destinations":null,
   "durations":null,
   "code":"TooBig",
   "message":null,
   "waypoints":null
}

This is the URL:

http://router.project-osrm.org/table/v1/driving/polyline(hne{Btu}tFghPmdD~loA|bk%40_m_A}_Ufp{%40vsRrHchAyrw%40wca%40ABtfw%40tbc%40fDycAs%40xjAo}eAgoc%40nveA~nb%40sx|%40k{b%40[fD_Na^ne%40j{%40{SozAsLTzm%40f_%40ud%40`BcpJwi%40%3Fh%40eH`e%40hReNrMgIrAhKmJf[r%40cH|CcVdGxAwwC`VnwoAhgg%40wu}%40gai%40e|Mli%40wiAlr%40t~%40eMfhFpA{Iv]b][}t%40}I{oBnAxaCz%40kf%40}DffHa}%40_jP|RbdKlfG_jHkqF`pF}f%40~h%40paH%3F%3F}}Gy|GvvFqgAuwHkp%40vlJzxKkaFscFquCeKdvJvlFgf%40u_Gys%40qaAl{A|bI_`KgwF`_KdyFAaEyeJqkFzeJbsEkqJ{{Jx|HvvBssIaxCrv%40fJv]~sEx~FcpCygIunAfgHvbKo|G}jDer%40slEdv%40rQ~Ge^sm%40zS`_%40nIc[cOr~%40lJjfHdvEkhIwtF}i%40rc%40~BgM|k%40uh%40npAjwBivBw`AreGhbDspAiCsiCm_D{t%40{Y~lAtBh{Cf}C{[v|%40`|Aos%40eBhX_CeA%40hCm_ADfDgb%40rkA|\iVMa%40NapA}F`hCcBgu%40gArk%40xBat%40zIr}%40gI}oCyTtmAv[umAw[pd%40yB~nA|c%40pSoNcfBgFun%40|KbKwAd{BmBud%40`PcsAyCfn%40cDan%40mFEpKxfJmpAa_C}{%40`_C|{%40sg%40jRkuAcrA~}Bv~%40ioA}UorJxsAxtC|KsDbB}iArT|iAsTu}AwLldBbPxyAprAyqBcoBzcIws%40%3F%3Fq_Aea%40dNjPsrBlgBpjEqrAqiE~jAxcE}kAmlLzu%40bdFzDhaFw}%40%3F%3Fc_GyGkaEpi%40dmKm^iqJls%40dqHepAacC~VwcEvf%40apJoyA|gQjhB%3F%3F_~Ex%40~}Ey%40mx^kdJ|tg%40tjOyhk%40o}Mj}j%40ztTugg%40_jUlyc%40fyUozOp_MzhLyqN{StXcAyw%40{xAinHyXdY%3F%3FtqEqkB_iEr~AlqEg{Afs%40jZnmD~jB_qM{jAntMf_DicDgbEteDfzBym%40eb%40ahLgt%40z~KfcApnAdX{gDu{Bpb%40dDuX_Dg|Ixd%40nrN~eC{tMwxBrpKxZomAelAxn`%40foOyn`%40goOr}s%40~l`%40acv%40sz`%40nav%40lqb%40u}u%40_bb%40~FoJxt_%40pbRrzZzuRgcBqaIm{A`yClhE||Dgrb%40ioZ|c\`oVugYgwUjy_%40bzYgo`%40wyY~BpDpg`%40rwYkgb%40ijZjgb%40hjZz}BdlAjaK|nGihJudFem|Am_p%40b}zAlrn%40uxAm[omxAc{m%40xsyAhaq%40_uyA{nq%40_Mqe%40rSuQmPbHk%40p~%40hk%40rk%40wa%40kmAzB{Rw%40B`Kje%40e^oqBetH_wHx^jH|qGzhH}sZmlFlb%40mg%40llYtuF}iZ}iEwt%40`Qz|y%40r~TjVha%40yG|gErd%40mxGoeAvf%40p~B_lAyBmA)

I’m sending about 300 pairs of lat/long in the URL. I’m not sure what’s going on here, is it the amount of pairs or the size of the URL, or maybe even something else?