feat: Add support for HTTP keep-alive between the proxy and upstream

test/test_keepalive.py

@@ -0,0 +1,31 @@
+import re
+
+
+def test_keepalive_disabled(docker_compose, nginxproxy):
+    r = nginxproxy.get("http://keepalive-disabled.nginx-proxy.test/headers")
+    assert r.status_code == 200
+    assert re.search(fr'(?m)^(?i:Connection): close$', r.text)
+
+def test_keepalive_disabled_other_headers_ok(docker_compose, nginxproxy):
+    """Make sure the other proxy_set_header headers are still set.
+
+    According to the nginx docs [1], any proxy_set_header directive in a block
+    disables inheritance of proxy_set_header directives in a parent block.  Make
+    sure that doesn't happen.
+
+    [1] https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_set_header
+    """
+    r = nginxproxy.get("http://keepalive-disabled.nginx-proxy.test/headers")
+    assert r.status_code == 200
+    assert re.search(fr'(?m)^(?i:X-Real-IP): ', r.text)
+
+def test_keepalive_enabled(docker_compose, nginxproxy):
+    r = nginxproxy.get("http://keepalive-enabled.nginx-proxy.test/headers")
+    assert r.status_code == 200
+    assert not re.search(fr'(?m)^(?i:Connection):', r.text)
+
+def test_keepalive_enabled_other_headers_ok(docker_compose, nginxproxy):
+    """See the docstring for the disabled case above."""
+    r = nginxproxy.get("http://keepalive-enabled.nginx-proxy.test/headers")
+    assert r.status_code == 200
+    assert re.search(fr'(?m)^(?i:X-Real-IP): ', r.text)