Add class attribute protocol to HTTPFileSystem (#1935)

Co-authored-by: Martin Durant <[email protected]>

Author: ap--

fsspec/implementations/http.py

@@ -43,6 +43,7 @@ class HTTPFileSystem(AsyncFileSystem):
     HTML href tags will be used.
     """
 
+    protocol = ("http", "https")
     sep = "/"
 
     def __init__(

fsspec/implementations/tests/test_http.py

@@ -630,3 +630,15 @@ def test_pipe_file(server, tmpdir, reset_files):
     bytesio = io.BytesIO(b"BytesIO content")
     fs.pipe_file(server.address + "/piped_bytes", bytesio.getvalue())
     assert fs.cat(server.address + "/piped_bytes") == b"BytesIO content"
+
+
+@pytest.mark.parametrize("protocol", ["http", "https"])
+def test_protocol_independent_of_first_used_protocol(protocol):
+    from fsspec import filesystem
+
+    filesystem(protocol)
+    fs0 = filesystem("http")
+    p0 = fs0.protocol[0] if isinstance(fs0.protocol, tuple) else fs0.protocol
+    fs1 = filesystem("https")
+    p1 = fs1.protocol[0] if isinstance(fs1.protocol, tuple) else fs1.protocol
+    assert p0 == p1 == "http"