diff --git a/fsspec/implementations/http.py b/fsspec/implementations/http.py
index 9699523cf..7386d4b80 100644
--- a/fsspec/implementations/http.py
+++ b/fsspec/implementations/http.py
@@ -541,7 +541,7 @@ async def _pipe_file(self, path, value, mode="overwrite", **kwargs):
         headers = kwargs.pop("headers", {})
         headers["Content-Length"] = str(len(value))
 
-        session = await self.get_session()
+        session = await self.set_session()
 
         async with session.put(url, data=value, headers=headers, **kwargs) as r:
             r.raise_for_status()
diff --git a/fsspec/tests/conftest.py b/fsspec/tests/conftest.py
index 31d99faf2..ccf7bdccf 100644
--- a/fsspec/tests/conftest.py
+++ b/fsspec/tests/conftest.py
@@ -73,7 +73,7 @@ def _respond(self, code=200, headers=None, data=b""):
             self.wfile.write(data)
 
     def do_GET(self):
-        baseurl = f"http://{self.server.server_name}:{self.server.server_port}"
+        baseurl = f"http://127.0.0.1:{self.server.server_port}"
         file_path = self.path
         if file_path.endswith("/") and file_path.rstrip("/") in self.files:
             file_path = file_path.rstrip("/")
@@ -130,7 +130,7 @@ def do_POST(self):
             assert self.headers.get("Transfer-Encoding") == "chunked"
             self.files[file_path] = b"".join(self.read_chunks())
         else:
-            self.files[file_path] = self.rfile.read(length)
+            self.files[file_path] = self.rfile.read(int(length))
         self._respond(200)
 
     do_PUT = do_POST
@@ -187,7 +187,7 @@ def serve():
     th.daemon = True
     th.start()
     try:
-        yield f"http://{httpd.server_name}:{httpd.server_port}"
+        yield f"http://127.0.0.1:{httpd.server_port}"
     finally:
         httpd.socket.close()
         httpd.shutdown()