[python] How can I get all the request headers in Django?

I need to get all the Django request headers. From what i've read, Django simply dumps everything into the request.META variable along with a lot aof other data. What would be the best way to get all the headers that the client sent to my Django application?

I'm going use these to build a httplib request.

For what it's worth, it appears your intent is to use the incoming HTTP request to form another HTTP request. Sort of like a gateway. There is an excellent module django-revproxy that accomplishes exactly this.

The source is a pretty good reference on how to accomplish what you are trying to do.

request.META.get('HTTP_AUTHORIZATION') /python3.6/site-packages/rest_framework/authentication.py

you can get that from this file though...

<b>request.META</b><br>
{% for k_meta, v_meta in request.META.items %}
  <code>{{ k_meta }}</code> : {{ v_meta }} <br>
{% endfor %}

Starting from Django 2.2, you can use request.headers to access the HTTP headers. From the documentation on HttpRequest.headers:

A case insensitive, dict-like object that provides access to all HTTP-prefixed headers (plus Content-Length and Content-Type) from the request.

The name of each header is stylized with title-casing (e.g. User-Agent) when it’s displayed. You can access headers case-insensitively:

>>> request.headers
{'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6', ...}

>>> 'User-Agent' in request.headers
True
>>> 'user-agent' in request.headers
True

>>> request.headers['User-Agent']
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6)
>>> request.headers['user-agent']
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6)

>>> request.headers.get('User-Agent')
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6)
>>> request.headers.get('user-agent')
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6)

To get all headers, you can use request.headers.keys() or request.headers.items().

This is another way to do it, very similar to Manoj Govindan's answer above:

import re
regex_http_          = re.compile(r'^HTTP_.+$')
regex_content_type   = re.compile(r'^CONTENT_TYPE$')
regex_content_length = re.compile(r'^CONTENT_LENGTH$')

request_headers = {}
for header in request.META:
    if regex_http_.match(header) or regex_content_type.match(header) or regex_content_length.match(header):
        request_headers[header] = request.META[header]

That will also grab the CONTENT_TYPE and CONTENT_LENGTH request headers, along with the HTTP_ ones. request_headers['some_key] == request.META['some_key'].

Modify accordingly if you need to include/omit certain headers. Django lists a bunch, but not all, of them here: https://docs.djangoproject.com/en/dev/ref/request-response/#django.http.HttpRequest.META

Django's algorithm for request headers:

1. Replace hyphen - with underscore _
2. Convert to UPPERCASE.
3. Prepend HTTP_ to all headers in original request, except for CONTENT_TYPE and CONTENT_LENGTH.

The values of each header should be unmodified.

I don't think there is any easy way to get only HTTP headers. You have to iterate through request.META dict to get what all you need.

django-debug-toolbar takes the same approach to show header information. Have a look at this file responsible for retrieving header information.

If you want to get client key from request header, u can try following:

from rest_framework.authentication import BaseAuthentication
from rest_framework import exceptions
from apps.authentication.models import CerebroAuth

class CerebroAuthentication(BaseAuthentication):
def authenticate(self, request):
    client_id = request.META.get('HTTP_AUTHORIZATION')
    if not client_id:
        raise exceptions.AuthenticationFailed('Client key not provided')
    client_id = client_id.split()
    if len(client_id) == 1 or len(client_id) > 2:
        msg = ('Invalid secrer key header. No credentials provided.')
        raise exceptions.AuthenticationFailed(msg)
    try:
        client = CerebroAuth.objects.get(client_id=client_id[1])
    except CerebroAuth.DoesNotExist:
        raise exceptions.AuthenticationFailed('No such client')
    return (client, None)

Simply you can use HttpRequest.headers from Django 2.2 onward. Following example is directly taken from the official Django Documentation under Request and response objects section.

>>> request.headers
{'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6', ...}

>>> 'User-Agent' in request.headers
True
>>> 'user-agent' in request.headers
True

>>> request.headers['User-Agent']
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6)
>>> request.headers['user-agent']
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6)

>>> request.headers.get('User-Agent')
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6)
>>> request.headers.get('user-agent')
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6)