Fix XSS in default DRF Browsable API template by re-enabling autoescape

Author: zyv

rest_framework/templates/rest_framework/base.html

@@ -171,10 +171,10 @@ <h1>{{ name }}</h1>
               </div>
 
               <div class="response-info" aria-label="{% trans "response info" %}">
-                <pre class="prettyprint"><span class="meta nocode"><b>HTTP {{ response.status_code }} {{ response.status_text }}</b>{% autoescape off %}{% for key, val in response_headers|items %}
+                <pre class="prettyprint"><span class="meta nocode"><b>HTTP {{ response.status_code }} {{ response.status_text }}</b>{% for key, val in response_headers|items %}
 <b>{{ key }}:</b> <span class="lit">{{ val|break_long_headers|urlize_quoted_links }}</span>{% endfor %}
 
-</span>{{ content|urlize_quoted_links }}</pre>{% endautoescape %}
+</span>{{ content|urlize_quoted_links }}</pre>
               </div>
             </div>