java - Bad or long request -

i have long form fit , session invalid , when press submit button lose of data. luckily, managed save next url after redirect on login form. works fine without problems other links.

but when try query bellow of long form :

 http://localhost:8080/ao-server/administration/connexion_admin?next=http%3a%2f%2flocalhost%3a8080%2fao-server%2fadministration%2fao%2fsave%3fetat_ao%3dnew%26pme%3d0%26acheteur%3d1274%26typemarche%3d9%26reference%3d51%252fmek%252f2016%2b%26dateouvertureplis%3d01%252f12%252f2016%26heure%3d09%26minute%3d00%26objet%3detude%2barchitecturale%2bet%2bsuivi%2bdes%2btravaux%2bd%25e2%2580%2599extension%2bde%2bs%252fs%2bouled%2bslime%2bcentre%2bcr%2bm%25e2%2580%2599haya%2bprovince%2bde%2bmekn%25c3%25a8s%2b%26estimation%3d2%26provinces%3d17-3%26datepublication%3d05%252f11%252f2016%26selectedactivites%3d505-3%26idao%3d16399%26from%3dcontrole%26idfils%3d%26idmodif%3d%26origin%3d%26content%3d%253cstrong%253eroyaume%2bdu%2bmaroc%2b%253cbr%253e%253cbr%253eminist%25c3%2588re%2bde%2bl%25e2%2580%2599education%2bnationale%2bet%2bde%2bla%2bformation%2bprofessionnelle%2b%253cbr%253e%253cbr%253eacad%25c3%2589mie%2br%25c3%2589gionale%2bde%2bl%25e2%2580%2599%25c3%2589ducation%2bet%2bde%2bla%2bformation%2br%25c3%2589gion%2bde%2bf%25c3%2588s-mekn%25c3%2588s%2b%253cbr%253e%253cbr%253edirection%2bprovinciale%2bde%2bmekn%25c3%2588s%2b%253cbr%253e%253cbr%253eservice%2bdes%2baffaires%2badministratives%2bet%2bfinanci%25c3%2588res%2b%253cbr%253e%253cbr%253ebureau%2bdes%2bmarches%253c%252fstrong%253e%253cbr%253e%253cbr%253e%253cbr%253eavis%2bde%2bconsultation%2barchitecturale%2bn%25c2%25b0%25c2%25a0%253cstrong%253e51%252fmek%252f2016%253c%252fstrong%253e%25c2%25a0%253cbr%253e%253cbr%253e%253cbr%253e%253cstrong%253ele%2b01%252f12%252f2016%2b%25c3%25a0%2bpartir%2bde%2b09%2bh%253c%252fstrong%253e%2b%252cselon%2bci-apr%25c3%25a8s%252c%2bil%2bsera%2bproc%25c3%25a9d%25c3%25a9%2bdans%2bla%2bsalle%2bdes%2br%25c3%25a9unions%2b%25c3%25a0%2bla%2bdirection%2bprovinciale%2bde%2bacad%25c3%25a9mie%2br%25c3%25a9gionale%2bde%2bl%25e2%2580%2599%25c3%25a9ducation%2bet%2bde%2bla%2bformation%2br%25c3%25a9gion%2bde%2bf%25c3%25a8s-mekn%25c3%25a8s%252c%2bavenue%2babdelkrim%2bel%2bkhattabi%2bsbata%2b%25c3%25a0%2bmekn%25c3%25a8s%2b%25c3%25a0%2bl%25e2%2580%2599ouverture%2bdes%2bplis%2bdes%2barchitectes%2brelatif%2bau%2bconsultation%2barchitecturale%2bsuivante%253a%2b%253cbr%253e%253cbr%253e-%2bn%25c2%25b0%2bde%2bla%2bconsultation%2barchitecturale%253a%2b%253cstrong%253e51%252fmek%252f2016%253c%252fstrong%253e%2b%253cbr%253e%253cbr%253e-%2bobjet%253a%2b%253cstrong%253eetude%2barchitecturale%2bet%2bsuivi%2bdes%2btravaux%2bd%25e2%2580%2599extension%2bde%2bs%252fs%2bouled%2bslime%2bcentre%2bcr%2bm%25e2%2580%2599haya%2bprovince%2bde%2bmekn%25c3%25a8s%253c%252fstrong%253e%2b%253cbr%253e%253cbr%253e%253cstrong%253e-%2bbudget%2bpr%25c3%25a9visionnel%2bmax%2bht%253c%252fstrong%253e%2bpour%2bl%25e2%2580%2599ex%25c3%25a9cution%2bdes%2btravaux%2ben%2bdhs%253a%2b%253cstrong%253e666%2b000.00%2bdh%253c%252fstrong%253e%2bsix%2bcent%2bsoixante-six%2bmille%2b%253cbr%253e%253cbr%253ele%2bdossier%2bde%2bla%2bconsultation%2barchitecturale%2bpeut%2b%25c3%25aatre%2bretir%25c3%25a9%2bau%2bbureau%2bdes%2bmarch%25c3%25a9s%2bde%2bla%2bdirection%2bprovinciale%2bde%2bl%25e2%2580%2599aref%2br%25c3%25a9gion%2bf%25c3%25a8s-mekn%25c3%25a8s%2b%25c3%25a0%2bmekn%25c3%25a8s%252c%2bil%2bpeut%2b%25c3%25a9galement%2b%25c3%25aatre%2bt%25c3%25a9l%25c3%25a9charg%25c3%25a9%2b%25c3%25a0%2bpartir%2bdu%2bportail%2bdes%2bmarch%25c3%25a9s%2bpublics%2bwww.marchespublics.gov.ma%2b%253cbr%253e%253cbr%253ele%2bcontenu%2bainsi%2bque%2bla%2bpr%25c3%25a9sentation%2bdes%2bdossiers%2bdes%2bconcurrents%2bdoivent%2b%25c3%25aatre%2bconformes%2baux%2bdispositions%2bdes%2barticles%2b100%252c%2b101%2bet%2b102%2bdu%2bd%25c3%25a9cret%2bn%25c2%25b0%2b2-12-349%2bdu%2b8%2bjoumada%2bi%2b1434%2b%252820%2bmars%2b2013%2529%2bfixant%2bles%2bconditions%2bet%2bles%2bformes%2bde%2bpassation%2bdes%2bmarch%25c3%25a9s%2bpour%2ble%2bcompte%2bde%2bl%25e2%2580%2599etat%2bet%2bdes%2b%25c3%25a9tablissements%2bpublics%2bainsi%2bque%2bcertaines%2br%25c3%25a8gles%2brelatives%2b%25c3%25a0%2bleurs%2bgestion%2bet%2b%25c3%25a0%2bleur%2bcontr%25c3%25b4le.%2b%253cbr%253e%253cbr%253eles%2barchitectes%2bpeuvent%253a%2b%253cbr%253e%253cbr%253e-soit%2bd%25c3%25a9poser%2bcontre%2br%25c3%25a9c%25c3%25a9piss%25c3%25a9%2bleurs%2bplis%2bdans%2bbureau%2bdes%2bmarch%25c3%25a9s%2bde%2bla%2bdirection%2bprovinciale%2bde%2bmekn%25c3%25a8s.%2b%253cbr%253e-soit%2bles%2benvoyer%252c%2bpar%2bcourrier%2brecommand%25c3%25a9%2bavec%2baccus%25c3%25a9%2bde%2br%25c3%25a9ception%2bau%2bbureau%2bpr%25c3%25a9cit%25c3%25a9.%2b%253cbr%253e-soit%2bles%2bremettre%2bau%2bpr%25c3%25a9sident%2bdu%2bjury%2bde%2bla%2bconsultation%2barchitecturale%2bau%2bd%25c3%25a9but%2bde%2bla%2bs%25c3%25a9ance%2bet%2bavant%2bl%25e2%2580%2599ouverture%2bdes%2bplis.%2b%253cbr%253e%253cbr%253eles%2bpi%25c3%25a8ces%2bjustificatives%2b%25c3%25a0%2bfournir%2bsont%2bcelles%2bpr%25c3%25a9vues%2bpar%2bl%25e2%2580%2599article%2b10%2bdu%2br%25c3%25a8glement%2bde%2bconsultation%2barchitecturale.%253cbr%253e%253cbr%253e%2bles%2bpi%25c3%25a8ces%2bfournies%2bdoivent%2b%25c3%25aatre%2boriginales%2bou%2bcopies%2bcertifi%25c3%25a9es%2bconformes%2b%25c3%25a0%2bl%25e2%2580%2599original%2bde%2bmoins%2bde%2btrois%2bmois. 

i got exception :

nov. 10, 2016 10:10:29 pm org.apache.coyote.http11.abstracthttp11processor process infos: error parsing http request header 

it's bad request

request method:post status code:400 bad request  

or it's long query because link work directly when save form , user logged

so how can solve prevent admins repeating long form ?

with request url of on 4000 characters (and example above 5000) can http 400 response, depending on browser/server side implementation.