Usando django-storage y el backend s3boto, ¿cómo agrego información de almacenamiento en caché para solicitar encabezados para una imagen para que el navegador guarde en caché la imagen?

Question

Estoy usando el backend s3boto, no el backend s3.

En el django-storages docs Dice para especificar la variable AWS_HEADERS en su archivo de settings.py:

AWS_HEADERS (opcionales)

Si desea establecer cabeceras enviadas con cada archivo de la almacenamiento:

# see http://developer.yahoo.com/performance/rules.html#expires 
AWS_HEADERS = { 
'Expires': 'Thu, 15 Apr 2010 20:00:00 GMT', 
'Cache-Control': 'max-age=86400', 
} 

Esto no funciona para mí.

Aquí es mi modelo:

class Photo(models.Model): 
    """ 
     docstring for Photo 
     represents a single photo.. a photo can have many things associated to it like 
     a project, a portfolio, etc... 
    """ 

    def image_upload_to(instance, filename): 
     today = datetime.datetime.today() 
     return 'user_uploads/%s/%s/%s/%s/%s/%s/original/%s' % (instance.owner.username, today.year, today.month, today.day, today.hour, today.minute, filename) 

    def thumb_upload_to(instance, filename): 
     today = datetime.datetime.today() 
     return 'user_uploads/%s/%s/%s/%s/%s/%s/thumb/%s' % (instance.owner.username, today.year, today.month, today.day, today.hour, today.minute, filename) 

    def medium_upload_to(instance, filename): 
     today = datetime.datetime.today() 
     return 'user_uploads/%s/%s/%s/%s/%s/%s/medium/%s' % (instance.owner.username, today.year, today.month, today.day, today.hour, today.minute, filename) 



    owner = models.ForeignKey(User) 
    # take out soon 
    projects = models.ManyToManyField('Project', through='Connection', blank=True) 
    image = models.ImageField(upload_to=image_upload_to) 
    thumb = ThumbnailerImageField(upload_to=thumb_upload_to, resize_source=dict(size=(102,102), crop='center'),) 
    medium = ThumbnailerImageField(upload_to=medium_upload_to, resize_source=dict(size=(700,525),)) 
    title = models.CharField(blank=True, max_length=300) 
    caption = models.TextField(blank=True) 
    can_view_full_res = models.BooleanField(default=False) 
    is_portfolio = models.BooleanField(default=False) 
    created_time = models.DateTimeField(blank=False, auto_now_add=True) 
    disabled = models.DateTimeField(blank=True, null=True, auto_now_add=False) 
    cost = models.FloatField(default=0) 
    rating = models.IntegerField(default=0) 
    mature_content = models.BooleanField(default=False) 
    objects = ViewableManager() 

    def get_absolute_url(self): 
     return "/m/photo/%i/" % self.pk 

    def get_prev_by_time(self): 
     get_prev = Photo.objects.order_by('-created_time').filter(created_time__lt=self.created_time) 
     try: 
      return get_prev[0] 
     except IndexError: 
      return None 

    def get_next_by_time(self): 
     get_next = Photo.objects.order_by('created_time').filter(created_time__gt=self.created_time) 
     try: 
      return get_next[0] 
     except IndexError: 
      return None 

    def __unicode__(self): 
     return(self.title) 

Esto es lo que está en mi plantilla en la que tengo la imagen ...

<img class='shadow' src='{{ object.medium.url }}'> 

Estas son las cabeceras de petición y respuesta:

Request URL:https://MY_UPLOAD_CONTAINER.s3.amazonaws.com/user_uploads/travismillward/2012/3/23/3/0/medium/_0677866898.jpg?Signature=s%2ByKsWDxrDJbyeVHd%2BDS3JlByts%3D&Expires=1332529522&AWSAccessKeyId=MY_ACCESS_KEYID 
Request Method:GET 
Status Code:200 OK 
Request Headersview parsed 
GET /user_uploads/travismillward/2012/3/23/3/0/medium/_0677866898.jpg?Signature=s%2ByKsWDxrDJbyeVHd%2BDS3JlByts%3D&Expires=1332529522&AWSAccessKeyId=MY_ACCESS_KEYID HTTP/1.1 
Host: MY_UPLOAD_CONTAINER.s3.amazonaws.com 
Connection: keep-alive 
Cache-Control: max-age=0 
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_3) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.83 Safari/535.11 
Accept: */* 
Referer: http://localhost:8000/m/photo/1/ 
Accept-Encoding: gzip,deflate,sdch 
Accept-Language: en-US,en;q=0.8 
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3 
Query String Parametersview URL encoded 
Signature:s+yKsWDxrDJbyeVHd+DS3JlByts= 
Expires:1332529522 
AWSAccessKeyId:MY_ACCESS_KEYID 
Response Headersview parsed 
HTTP/1.1 200 OK 
x-amz-id-2: wOWRRDi5TItAdiYSPf8X4z4I4v5/Zu8XLhwlxmZa8w8w1Jph8WQkenihVJI/ZKnV 
x-amz-request-id: THE_X_AMZ_REQUEST_ID 
Date: Fri, 23 Mar 2012 18:05:24 GMT 
Cache-Control: max-age=86400 
Last-Modified: Fri, 23 Mar 2012 09:00:13 GMT 
ETag: "6e34e718a349e0bf9e4aefc1afad3d7d" 
Accept-Ranges: bytes 
Content-Type: image/jpeg 
Content-Length: 91600 
Server: AmazonS3 

Cuando pegue la ruta de acceso a la imagen en la barra de direcciones, ENCAJA la imagen y me da un 304 ... Aquí están t solicitud de manguera y las cabeceras de respuesta:

Request URL:https://MY_UPLOAD_CONTAINER.s3.amazonaws.com/user_uploads/travismillward/2012/3/23/3/0/medium/_0677866898.jpg?Signature=evsDZiw3QGsjPacG4CHn6Ji2dDA%3D&Expires=1332528782&AWSAccessKeyId=MY_ACCESS_KEYID 
Request Method:GET 
Status Code:304 Not Modified 
Request Headersview parsed 
GET /user_uploads/travismillward/2012/3/23/3/0/medium/_0677866898.jpg?Signature=evsDZiw3QGsjPacG4CHn6Ji2dDA%3D&Expires=1332528782&AWSAccessKeyId=MY_ACCESS_KEYID HTTP/1.1 
Host: MY_UPLOAD_CONTAINER.s3.amazonaws.com 
Connection: keep-alive 
Cache-Control: max-age=0 
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_3) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.83 Safari/535.11 
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 
Referer: http://localhost:8000/m/photo/1/ 
Accept-Encoding: gzip,deflate,sdch 
Accept-Language: en-US,en;q=0.8 
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3 
If-None-Match: "6e34e718a349e0bf9e4aefc1afad3d7d" 
If-Modified-Since: Fri, 23 Mar 2012 09:00:13 GMT 
Query String Parametersview URL encoded 
Signature:evsDZiw3QGsjPacG4CHn6Ji2dDA= 
Expires:1332528782 
AWSAccessKeyId:MY_ACCESS_KEYID 
Response Headersview parsed 
HTTP/1.1 304 Not Modified 
x-amz-id-2: LfdHa10SdWnx4UH1rc62NfUDeiNVGRzBX73CR+6GDrXJgv9zo+vyQ9A3HCr1YLVa 
x-amz-request-id: THE_X_AMZ_REQUEST_ID 
Date: Fri, 23 Mar 2012 18:01:16 GMT 
Last-Modified: Fri, 23 Mar 2012 09:00:13 GMT 
ETag: "6e34e718a349e0bf9e4aefc1afad3d7d" 
Server: AmazonS3 

Answer 1

Gracias a blackrobot que me dio esta respuesta.

Añadir lo siguiente a su settings.py:

AWS_QUERYSTRING_AUTH = False