What is apache s maximum url length

Question

What is the maximum length of a URL in apache  Where is it documented  and is it configurable   I m implementing an openid identity provider  and would like to know the limitations I m up against  I know about the 2048 byte path limit on Internet Explorer  That can be handled specially using user agent detection  Other browsers have much higher URL limits    So what I m interested in is apache server limits when coding an application

User · Accepted Answer

The default limit for the length of the request line is 8190 bytes  see LimitRequestLine directive   And if we subtract three bytes for the request method  i e  GET   eight bytes for the version information  i e  HTTP 1 0 HTTP 1 1  and two bytes for the separating space  we end up with 8177 bytes for the URI path plus query

User · Answer

The official length according to the offical Apache docs is 8 192  but many folks have run into trouble at  4 000   MS Internet Explorer is usually the limiting factor anyway  as it caps the maximum URL size at 2 048

User · Answer

Allowed default size of URI is 8177 characters in GET request  Simple code in python for such testing      usr bin env python2  import sys import socket  if   name         main         string   sys argv 1      buf get    x    int string      buf size   1024     request    HEAD  s HTTP 1 1 nHost localhost n n    buf get     print      gt    request      sock http   socket socket socket AF INET  socket SOCK STREAM      sock http connect   localhost   80       sock http send request      while True         print     gt    sock http recv buf size         if not sock http recv buf size              break     sock http close     On 8178 characters you will get such message      HTTP 1 1 414 Request-URI Too Large

User · Answer

Internet Explorer  2 083 characters  with no more than 2 048 characters in the path portion of the URL Firefox  65 536 characters show up  but longer URLs do still work even up past 100 000 Safari    80 000 characters Opera    190 000 characters IIS  16 384 characters  but is configurable Apache  4 000 characters   From  http   www danrigsby com blog index php 2008 06 17 rest-and-max-url-size

User · Answer

The default limit for the length of the request line is 8192 bytes   8  1024  It you want to change the limit  you have to add or update in your tomcat server xml the attribut maxHttpHeaderSize   as    lt Connector port  8080  maxHttpHeaderSize  65536  protocol  HTTP 1 1        gt    In this example I set the limite to 65536 bytes  64 1024   Hope this will help

User · Answer

Here s a bash script to check the maximum limit of a remote server  uses curl and perl    You just need some kind of an url that can be extended with  x  and always return 200  or adapt it to your needs   At some point it will break and the script will display the max length   Here s the code   url  http   someurl someendpoint var1 blah amp token   ok 0 times 1  while    do     length    times    url        echo trying with  length     token   perl -le  print  x x  times      result   curl -sLw    http code   -o  dev null    url   token         if     result    200     then         if     ok     times     then             echo  max length is  length              break         fi         ok  times         times    times 1024       else         times     times ok  2       fi done

[apache] What is apache's maximum url length?

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