How to modify http headers sent with an elasticsearch request?

I’ve searched the documentation/internet and cannot find an answer to this question. How do I pass in extra headers to http requests in say methods like elasticsearch.Elasticsearch.search? Well really it would be most convenient if I could just do it once at say instantiation of elasticsearch.Elasticsearch…

How is this most easily achieved?

[honzakral]

Currently there is no direct way to inject your own headers. What I recommend is to subclass the connection class and modify the headers there:

from elasticsearch import Urllib3HttpConnection, Elasticsearch
class MyConnection(Urllib3HttpConnection):
    def __init__(*args, **kwargs):
        extra_headers = kwargs.pop('extra_headers', {})
        super(MyConnection, self).__init__(*args, **kwargs)
        self.headers.update(extra_headers)

es = Elasticsearch(connection_class=MyConnection, extra_headers={'Any': 'header'})

Unfortunately there is no easy way to do this on a per-api basis.

Hope this helps.

[sfariaNG]

Thanks for the snippet @HonzaKral For anyone looking at this in future, I modified his code to allow sending a custom header with a value set at request time:

from elasticsearch import Urllib3HttpConnection

class MyUrllib3Http(Urllib3HttpConnection):
    def __init__(self, *args, **kwargs):
        internal_params = kwargs.pop("internal_params", {})
        super(MyUrllib3Http, self).__init__(*args, **kwargs)
        self.internal_params = internal_params

    def perform_request(self, method, url, params=None, body=None, timeout=None, ignore=(), headers=None):
        for param,header in self.internal_params.items():
          if param in params:
            headers = {} if headers is None else headers
            headers[header] = params.pop(param)

        return super().perform_request(method, url, params=params, body=body, timeout=timeout, ignore=ignore, headers=headers)

internal_params is a dict whose keys are the param keys in params and values are the header their value should be placed in.