Merge pull request #777 from glic3rinu/master

Break long headers on the browsable API

docs/topics/release-notes.md

@@ -44,6 +44,7 @@ You can determine your currently installed version using `pip freeze`:
 
 * OAuth2 authentication no longer requires unneccessary URL parameters in addition to the token.
 * URL hyperlinking in browseable API now handles more cases correctly.
+* Long HTTP headers in browsable API are broken in multiple lines when possible.
 * Bugfix: Fix regression with DjangoFilterBackend not worthing correctly with single object views.
 * Bugfix: OAuth should fail hard when invalid token used.
 * Bugfix: Fix serializer potentially returning `None` object for models that define `__bool__` or `__len__`. 

rest_framework/templates/rest_framework/base.html

@@ -115,7 +115,7 @@
             </div>
             <div class="response-info">
                 <pre class="prettyprint"><div class="meta nocode"><b>HTTP {{ response.status_code }} {{ response.status_text }}</b>{% autoescape off %}
-{% for key, val in response.items %}<b>{{ key }}:</b> <span class="lit">{{ val|urlize_quoted_links }}</span>
+{% for key, val in response.items %}<b>{{ key }}:</b> <span class="lit">{{ val|break_long_headers|urlize_quoted_links }}</span>
 {% endfor %}
 </div>{{ content|urlize_quoted_links }}</pre>{% endautoescape %}
             </div>

rest_framework/templatetags/rest_framework.py

@@ -260,3 +260,14 @@ def urlize_quoted_links(text, trim_url_limit=None, nofollow=True, autoescape=Tru
         elif autoescape:
             words[i] = escape(word)
     return ''.join(words)
+
+
+@register.filter
+def break_long_headers(header):
+    """
+    Breaks headers longer than 160 characters (~page length)
+    when possible (are comma separated)
+    """
+    if len(header) > 160 and ',' in header:
+        header = mark_safe('<br> ' + ', <br>'.join(header.split(',')))
+    return header