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{
  "sitecore": {
    "context": {
      "pageEditing": false,
      "language": "en",
      "site": { "name": "my-site" }
    },
    "route": {
      "name": "home",
      "fields": {

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var cacheDuration = Sitecore.Configuration.Settings.GetTimeSpanSetting("MyProject.Cache.Duration", TimeSpan.FromMinutes(30));

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<!-- App_Config/Include/Project/Z.Project.Environment.config -->
<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/" 
               xmlns:role="http://www.sitecore.net/xmlconfig/role/"
               xmlns:env="http://www.sitecore.net/xmlconfig/env/">
  <sitecore>
    <settings>

      <!-- Applies to every CD server, regardless of environment -->
      <setting name="MyProject.Analytics.Enabled" value="true"
               role:require="ContentDelivery" />

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<configSections>
  <section name="sitecore" type="Sitecore.Configuration.RuleBasedConfigReader, Sitecore.Kernel" />
</configSections>

<sitecore configSource="App_Config\Sitecore.config" />

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<!-- web.config on a CD server in the DEV environment -->
<appSettings>
  <add key="role:define" value="ContentDelivery" />
  <add key="env:define" value="DEV" />
</appSettings>

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<setting name="MyFeature.CacheEnabled" value="true" role:require="ContentDelivery" />

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<!-- web.config on a Content Delivery server -->
<appSettings>
  <add key="role:define" value="ContentDelivery" />
</appSettings>

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curl -I https://yoursite.com/~/media/Documents/Factsheet.ashx

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private void SetAttachmentDisposition(HttpResponse response, string name, string extension)
{
    string filename = $"{name}.{extension}";

    string encoded = Uri.EscapeDataString(filename);

    response.Headers["Content-Disposition"] = $"attachment; filename=\"{filename}\"; filename*=UTF-8''{encoded}";
}

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<?xml version="1.0" encoding="utf-8" ?>

<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
  <sitecore>
    <mediaLibrary>
      <mediaProvider type="MyProject.Foundation.Media.CustomMediaProvider, MyProject.Foundation.Media" patch:instead="*[@type='Sitecore.Resources.Media.MediaProvider, Sitecore.Kernel']" />
    </mediaLibrary>
  </sitecore>
</configuration>