diff --git a/github2/core.py b/github2/core.py
index 91ce29d..def3b1d 100644
--- a/github2/core.py
+++ b/github2/core.py
@@ -34,8 +34,9 @@ class GithubCommand(object):
 
     def make_request(self, command, *args, **kwargs):
         filter = kwargs.get("filter")
-        post_data = kwargs.get("post_data")
-        if post_data:
+        post_data = kwargs.get("post_data") or {}
+        method = kwargs.get("method", "GET")
+        if post_data or method.upper() == "POST":
             response = self.request.post(self.domain, command, *args,
                                          **post_data)
         else:
diff --git a/github2/repositories.py b/github2/repositories.py
index 1a3befb..9ca71c0 100644
--- a/github2/repositories.py
+++ b/github2/repositories.py
@@ -66,7 +66,7 @@ class Repositories(GithubCommand):
 
     def remove_collaborator(self, repo_name, username):
         return self.make_request("collaborators", repo_name, "remove",
-                                 username)
+                                 username, method="POST")
 
     def network(self, project):
         return self.make_request("show", project, "network", filter="network")
diff --git a/github2/request.py b/github2/request.py
index 00a09a2..4f79d3e 100644
--- a/github2/request.py
+++ b/github2/request.py
@@ -47,26 +47,26 @@ class GithubRequest(object):
 
     def post(self, *path_components, **extra_post_data):
         path_components = filter(None, path_components)
-        return self.make_request("/".join(path_components), extra_post_data)
+        return self.make_request("/".join(path_components), extra_post_data,
+            method="POST")
 
-    def make_request(self, path, extra_post_data=None):
+    def make_request(self, path, extra_post_data=None, method="GET"):
         extra_post_data = extra_post_data or {}
         url = "/".join([self.url_prefix, path])
-        return self.raw_request(url, extra_post_data)
+        return self.raw_request(url, extra_post_data, method=method)
 
-    def raw_request(self, url, extra_post_data):
+    def raw_request(self, url, extra_post_data, method="GET"):
         resource = urlparse(url)
         post_data = None
         headers = self.http_headers
         headers["Accept"] = "text/html"
-        method = "GET"
-        if extra_post_data:
+        method = method.upper()
+        if extra_post_data or method == "POST":
             post_data = self.encode_authentication_data(extra_post_data)
             headers["Content-Length"] = str(len(post_data))
-            method = "POST"
         connector = self.connector_for_scheme[resource.scheme]
         connection = connector(resource.hostname, resource.port)
-        connection.request("GET", resource.path, post_data, headers)
+        connection.request(method, resource.path, post_data, headers)
         response = connection.getresponse()
         response_text = response.read()
         if self.debug: