diff --git a/gallery_dl/extractor/danbooru.py b/gallery_dl/extractor/danbooru.py
index 56d81e5b..9e6516e0 100644
--- a/gallery_dl/extractor/danbooru.py
+++ b/gallery_dl/extractor/danbooru.py
@@ -36,7 +36,7 @@ class DanbooruExtractor(BaseExtractor):
         username, api_key = self._get_auth_info()
         if username:
             self.log.debug("Using HTTP Basic Auth for user '%s'", username)
-            self.session.auth = (username, api_key)
+            self.session.auth = util.HTTPBasicAuth(username, api_key)
 
     def skip(self, num):
         pages = num // self.per_page
diff --git a/gallery_dl/extractor/deviantart.py b/gallery_dl/extractor/deviantart.py
index 2c37ef12..1852dc1b 100644
--- a/gallery_dl/extractor/deviantart.py
+++ b/gallery_dl/extractor/deviantart.py
@@ -1239,7 +1239,7 @@ class DeviantartOAuthAPI():
             self.log.info("Requesting public access token")
             data = {"grant_type": "client_credentials"}
 
-        auth = (self.client_id, self.client_secret)
+        auth = util.HTTPBasicAuth(self.client_id, self.client_secret)
         response = self.extractor.request(
             url, method="POST", data=data, auth=auth, fatal=False)
         data = response.json()
diff --git a/gallery_dl/extractor/oauth.py b/gallery_dl/extractor/oauth.py
index d1f135d8..65db94d0 100644
--- a/gallery_dl/extractor/oauth.py
+++ b/gallery_dl/extractor/oauth.py
@@ -183,7 +183,7 @@ class OAuthBase(Extractor):
         }
 
         if auth:
-            auth = (client_id, client_secret)
+            auth = util.HTTPBasicAuth(client_id, client_secret)
         else:
             auth = None
             data["client_id"] = client_id
diff --git a/gallery_dl/extractor/pixeldrain.py b/gallery_dl/extractor/pixeldrain.py
index 34b4ebff..5cfdc43f 100644
--- a/gallery_dl/extractor/pixeldrain.py
+++ b/gallery_dl/extractor/pixeldrain.py
@@ -9,7 +9,7 @@
 """Extractors for https://pixeldrain.com/"""
 
 from .common import Extractor, Message
-from .. import text
+from .. import text, util
 
 BASE_PATTERN = r"(?:https?://)?pixeldrain\.com"
 
@@ -23,7 +23,7 @@ class PixeldrainExtractor(Extractor):
     def _init(self):
         api_key = self.config("api-key")
         if api_key:
-            self.session.auth = ("", api_key)
+            self.session.auth = util.HTTPBasicAuth("", api_key)
 
     def parse_datetime(self, date_string):
         return text.parse_datetime(
diff --git a/gallery_dl/extractor/reddit.py b/gallery_dl/extractor/reddit.py
index c0bf5b3e..feb6d1fe 100644
--- a/gallery_dl/extractor/reddit.py
+++ b/gallery_dl/extractor/reddit.py
@@ -423,9 +423,10 @@ class RedditAPI():
                                    "grants/installed_client"),
                     "device_id": "DO_NOT_TRACK_THIS_DEVICE"}
 
+        auth = util.HTTPBasicAuth(self.client_id, "")
         response = self.extractor.request(
             url, method="POST", headers=self.headers,
-            data=data, auth=(self.client_id, ""), fatal=False)
+            data=data, auth=auth, fatal=False)
         data = response.json()
 
         if response.status_code != 200:
diff --git a/gallery_dl/util.py b/gallery_dl/util.py
index 59be4d9b..53502ef0 100644
--- a/gallery_dl/util.py
+++ b/gallery_dl/util.py
@@ -490,6 +490,19 @@ CODES = {
 }
 
 
+class HTTPBasicAuth():
+    __slots__ = ("authorization",)
+
+    def __init__(self, username, password):
+        self.authorization = b"Basic " + binascii.b2a_base64(
+            username.encode("latin1") + b":" + str(password).encode("latin1")
+        )[:-1]
+
+    def __call__(self, request):
+        request.headers["Authorization"] = self.authorization
+        return request
+
+
 class LazyPrompt():
     __slots__ = ()