404 errors when calling an asp.net MVC 3 controlle

I've an action that I've to put in a GET request.

The URL is build live, and looks like this:

https://my-domain.com/MyController/MyAction?MyParameter=8259%2C8318%2C8201%2C8188%2C7155%2C6894%2C8221%2C8187%2C7030%2C8214%2C7489%2C8145%2C8223%2C8208%2C8273%2C8257%2C8292%2C6931%2C7072%2C7007%2C8195%2C8235%2C7493%2C7525%2C7492%2C8262%2C7491%2C7013%2C8157%2C7180%2C7181%2C7182%2C7183%2C7421%2C7422%2C7500%2C7501%2C8238%2C8239%2C8240%2C8241%2C7710%2C7711%2C7712%2C7713%2C8068%2C8432%2C7358%2C7008%2C8135%2C8307%2C8163%2C8164%2C8132%2C8182%2C8183%2C8081%2C8083%2C8109%2C8110%2C7681%2C7682%2C7683%2C7593%2C7594%2C7595%2C7546%2C7547%2C7548%2C7577%2C7578%2C7581%2C8300%2C8301%2C8302%2C8282%2C8283%2C8284%2C8311%2C8312%2C8313%2C8217%2C8218%2C8244%2C8245%2C8479%2C8482%2C8398%2C8399%2C8400%2C8401%2C8404%2C8407%2C8392%2C8394%2C6959%2C6960%2C6961%2C7041%2C7042%2C7043%2C8227%2C8228%2C8229%2C7638%2C7708%2C7118%2C8288%2C6897%2C6898%2C6899%2C6900%2C6901%2C6902%2C6842%2C6843%2C6844%2C6845%2C6846%2C6847%2C7361%2C7362%2C7363%2C7364%2C7365%2C7366%2C8165%2C8166%2C8167%2C8168%2C8169%2C8170%2C8247%2C8248%2C8249%2C8250%2C8251%2C8252%2C8099%2C8100%2C6903%2C6904%2C6905%2C6906%2C6907%2C6908%2C7704%2C8291%2C8253%2C7709%2C8277%2C7372%2C7282%2C7552%2C8205%2C7341%2C8264%2C7384%2C7701%2C7432%2C7625%2C7169%2C6912%2C8095%2C7481%2C8452%2C7062%2C7664%2C8088%2C8209%2C8278%2C6986%2C6978%2C7128%2C7440%2C6987%2C8224%2C8225%2C8178%2C8179%2C6889%2C6890%2C8191%2C8093%2C8230%2C7317%2C6895%2C8211%2C8226%2C8285%2C7266%2C7321%2C7445%2C7672%2C7453%2C7476%2C7533%2C6967%2C8054%2C7377%2C7188%2C8323%2C8105%2C7276%2C8202%2C8072%2C7689%2C8434%2C7075%2C7257%2C7379%2C6864%2C7570%2C8146%2C8147%2C8148%2C8149%2C7018%2C7019%2C7020%2C7021%2C8031%2C7044%2C7278%2C7486%2C8409%2C7707%2C8438%2C7378%2C7265%2C7176%2C7199%2C7706%2C7632%2C6998%2C7584%2C8171%2C7399%2C7125%2C6836%2C7535%2C7528%2C6968%2C7327%2C8319%2C8098%2C7543%2C6852%2C7103%2C6882%2C8426%2C8114%2C6957%2C6952%2C7527%2C6956%2C6953%2C8196%2C6989%2C7246%2C8272%2C8320%2C8324%2C6979%2C8315%2C8293%2C8294%2C8322%2C8204%2C7203%2C7326%2C7355%2C7087%2C7009%2C7498%2C7700%2C8113%2C8274%2C8325%2C8321%2C8116%2C7211%2C7252%2C7332%2C7023%2C7074%2C6977%2C7603%2C8096%2C7063%2C7014%2C7416%2C8190%2C8310%2C7032%2C7129%2C7136%2C7131%2C7187%2C7170%2C7159%2C7532%2C7651%2C7262%2C7670%2C7402%2C7403%2C7245%2C7235%2C7601%2C7316%2C7545%2C7343%2C7376%2C7665%2C7688%2C7374%2C7375%2C8041%2C7404%2C7409%2C7419%2C8422%2C7461%2C7438%2C7443%2C7487%2C7464%2C7515%2C7514%2C7512%2C7523%2C7598%2C8176%2C7544%2C7620%2C7652%2C7690%2C8330%2C8335%2C8418%2C8417%2C8421%2C8442%2C8458%2C8492%2C8457%2C8474%2C8483

And I get a 404 error.

If I replace the %2C by the original ,I got the same problem, just with a little more parameters.

If I make the same request with less parameters, it works.

I already have this:

<system.web>
    <httpRuntime maxUrlLength="2097151" maxQueryStringLength="2097151" relaxedUrlToFileSystemMapping="true"/>
</system.web>

Because previously I was having telling me that I was having a maxQueryStringLength set too big.

回答1:

No matter how large you set the maxQueryStringLength, there's a limit in the browsers. For example some browsers support a request length of only 2048 characters. Yours is longer (2440 characters). The only thing you could do is to use POST instead of GET to send such large data because POST requests doesn't have such limitation. So you generate an HTML <form> element with method="post" and action pointing to the url and a hidden field inside it containing this data and then submit this form.

回答2:

In fact, I was blocked by an IIS limit: the maxUrl size and max query size(which is measured in octet:

  <system.webServer>
      <security>
        <requestFiltering>
          <requestLimits maxUrl="1048576" maxQueryString="1048576" />
        </requestFiltering>
      </security>
  </system.webServer>

This resolved my problem