What is the size limit of a post request

Question

Sorry if this is duplicate I would think it would be but couldn t find anything   I have a flex application that I am posting data back to a php mysql server via IE  I haven t run into any problems yet  but knowing this ahead of time might save me a bunch of frustration and work  Is there a size limit to posting data via http    This article says no  http   www netlobo com ie form submit html  This discussion says yes  http   bytes com topic php answers 538226-what-maximum-limit-using-post-method  And it all goes back and forth what I m able to find online  So please limit answers to personally tested verified numbers   I am wanting to post back an XML string that can be quite large  say up to 5mb    If it makes any difference  browser will always be IE  our product requires it   post is coming from and httpService in flex  web server is php  DB is mySql

User · Answer

Also  in PHP INI file there is a setting   max input vars   which in my version of PHP  5 4 16 defaults to 1000   From the manual   How many input variables may be accepted  limit is applied to   GET    POST and   COOKIE superglobal separately    Ref   http   www php net manual en info configuration php ini max-input-vars

User · Answer

The url portion of a request  GET and POST  can be limited by both the browser and the server - generally the safe size is 2KB as there are almost no browsers or servers that use a smaller limit   The body of a request  POST  is normally  limited by the server on a byte size basis in order to prevent a type of DoS attack  note that this means character escaping can increase the byte size of the body   The most common server setting is 10MB  though all popular servers allow this to be increased or decreased via a setting file or panel    Some exceptions exist with older cell phone or other small device browsers - in those cases it is more a function of heap space reserved for this purpose on the device then anything else

User · Answer

It depends on a server configuration  If you re working with PHP under Linux or similar  you can control it using  htaccess configuration file  like so    set max post size php value post max size 20M   And  yes  I can personally attest to the fact that this works     If you re using IIS  I don t have any idea how you d set this particular value

User · Answer

For developers who cannot change php configuration because of the webhosting   My settings 256MB max size  1000 max variables   I got the same issue that just 2 out of 5 big data objects  associative arrays  with substructures were received on the server side    I find out that the whole substructure is being  flattened  in the post request  So  one object becomes a hundreds of literal variables  At the end  instead of 5 Object variables it is in reality sending dozens of hundreds elementar variables   Solution in this case is to serialize each of the substructures into String  Then it is received on the server as 5 String variables  Example    variable1 JSON stringify myDataObject1  variable2 JSON stringify myDataObject2

User · Answer

By default  the post request has maximum size of 8mb  But you can modify it according to your requirements  The modification can be done by opening php ini file  php configuration setting     Find  post max size 8M    for me  that was on line 771   replace 8 according to your requirements

User · Answer

It is up to the http server to decide if there is a limit   The product I work on allows the admin to configure the limit

User · Answer

You can post large amount of data by setting php ini variable  max input vars Default size of this variable is 1000 but if you want to sent large amount of data  you have to increase the size accordingly  If you can t set the size from ini set you have to do it through htaccess or by doing changes into php ini file directly   max input vars  2500 memory limit    256M

User · Answer

One of the best solutions for this  you do not use multiple or more than 1 000 input fields  You can concatenate multiple inputs with any special character  for ex      See this    lt input type  text  name  hs1  id  hs1  gt   lt input type  text  name  hs2  id  hs2  gt   lt input type  text  name  hs3  id  hs3  gt   lt input type  text  name  hs4  id  hs4  gt   lt input type  text  name  hs5  id  hs5  gt    lt input type  hidden  name  hd  id  hd  gt    Using any script  JavaScript or JScript    document getElementById  hd   value   document getElementById  hs1   value     document getElementById  hs2   value     document getElementById  hs3   value     document getElementById  hs4   value     document getElementById  hs5   value   With this  you will bypass the max input vars issue  If you increase max input vars in the php ini file  that is harmful to the server because it uses more server cache memory  and this can sometimes crash the server

User · Answer

As David pointed out  I would go with KB in most cases  php value post max size 2K  Note  my form is simple  just a few text boxes  not long text   PHP shorthand for KB is K  as outlined here

[php] What is the size limit of a post request?

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