| # Thread Safety | |
| This page contains important information about the thread safety of this library. | |
| ## The httplib2.Http() objects are not thread-safe | |
| The google-api-python-client library is built on top of the [httplib2](https://github.com/httplib2/httplib2) library, which is not thread-safe. Therefore, if you are running as a multi-threaded application, each thread that you are making requests from must have its own instance of `httplib2.Http()`. | |
| The easiest way to provide threads with their own `httplib2.Http()` instances is to either override the construction of it within the service object or to pass an instance via the http argument to method calls. | |
| ```python | |
| import google.auth | |
| import googleapiclient | |
| import google_auth_httplib2 | |
| import httplib2 | |
| from googleapiclient import discovery | |
| # Create a new Http() object for every request | |
| def build_request(http, *args, **kwargs): | |
| new_http = google_auth_httplib2.AuthorizedHttp(credentials, http=httplib2.Http()) | |
| return googleapiclient.http.HttpRequest(new_http, *args, **kwargs) | |
| authorized_http = google_auth_httplib2.AuthorizedHttp(credentials, http=httplib2.Http()) | |
| service = discovery.build('api_name', 'api_version', requestBuilder=build_request, http=authorized_http) | |
| # Pass in a new Http() manually for every request | |
| service = discovery.build('api_name', 'api_version') | |
| http = google_auth_httplib2.AuthorizedHttp(credentials, http=httplib2.Http()) | |
| service.stamps().list().execute(http=http) | |
| ``` | |