diff --git a/botocore/auth.py b/botocore/auth.py
index 7351fd5d41..f9fac833fe 100644
--- a/botocore/auth.py
+++ b/botocore/auth.py
@@ -30,7 +30,6 @@
     encodebytes,
     ensure_unicode,
     parse_qs,
-    parse_qsl,
     quote,
     unquote,
     urlsplit,
@@ -165,8 +164,6 @@ def add_auth(self, request):
         if request.data:
             # POST
             params = request.data
-            if not isinstance(params, dict):
-                params = dict(parse_qsl(params))
         else:
             # GET
             params = request.params
diff --git a/botocore/handlers.py b/botocore/handlers.py
index dcb814640b..b848014fae 100644
--- a/botocore/handlers.py
+++ b/botocore/handlers.py
@@ -1148,14 +1148,18 @@ def remove_content_type_header_for_presigning(request, **kwargs):
         del request.headers['Content-Type']
 
 
-def urlencode_body(model, params, **kwargs):
+def urlencode_body(model, params, context, **kwargs):
     """Urlencode the request body if it is a dictionary.
 
     This is used for services like S3 that require the body to be urlencoded
     when the body is a dictionary.
     """
     body = params.get('body')
-    if model.service_model.protocol == 'query' and isinstance(body, dict):
+    if (
+        context['client_config'].signature_version != 'v2'
+        and model.service_model.protocol == 'query'
+        and isinstance(body, dict)
+    ):
         params['body'] = urlencode(body, doseq=True, encoding='utf-8').encode(
             'utf-8'
         )
@@ -1163,7 +1167,12 @@ def urlencode_body(model, params, **kwargs):
 
 def compress_request(model, params, context, **kwargs):
     body = params.get('body')
-    if model.request_compression and body is not None:
+    config = context['client_config']
+    if config.signature_version == 'v2':
+        logger.debug(
+            "Request compression is not supported for signature version 2"
+        )
+    elif model.request_compression and body is not None:
         AWS_REQUEST_COMPRESSOR.compress(body, context['client_config'], model)