Custom domain: increase header value length (#10625)

Headers like CSP can be pretty long.

Author: stsewd

readthedocs/projects/migrations/0104_alter_httpheader_value.py

@@ -0,0 +1,17 @@
+# Generated by Django 4.2.4 on 2023-08-10 21:03
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("projects", "0103_alter_emailhook_project_alter_webhook_project"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="httpheader",
+            name="value",
+            field=models.CharField(max_length=4096),
+        ),
+    ]

readthedocs/projects/models.py

@@ -1890,7 +1890,7 @@ class HTTPHeader(TimeStampedModel, models.Model):
         max_length=128,
         choices=HEADERS_CHOICES,
     )
-    value = models.CharField(max_length=256)
+    value = models.CharField(max_length=4096)
     only_if_secure_request = models.BooleanField(
         help_text='Only set this header if the request is secure (HTTPS)',
     )