perf: use global httpx client instead of per request create new one (#34311)

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

api/core/plugin/impl/base.py

@@ -17,6 +17,7 @@ from pydantic import BaseModel
 from yarl import URL
 
 from configs import dify_config
+from core.helper.http_client_pooling import get_pooled_http_client
 from core.plugin.endpoint.exc import EndpointSetupFailedError
 from core.plugin.entities.plugin_daemon import PluginDaemonBasicResponse, PluginDaemonError, PluginDaemonInnerError
 from core.plugin.impl.exc import (
@@ -54,6 +55,11 @@ T = TypeVar("T", bound=(BaseModel | dict[str, Any] | list[Any] | bool | str))
 
 logger = logging.getLogger(__name__)
 
+_httpx_client: httpx.Client = get_pooled_http_client(
+    "plugin_daemon",
+    lambda: httpx.Client(limits=httpx.Limits(max_keepalive_connections=50, max_connections=100), trust_env=False),
+)
+
 
 class BasePluginClient:
     def _request(
@@ -84,7 +90,7 @@ class BasePluginClient:
             request_kwargs["content"] = prepared_data
 
         try:
-            response = httpx.request(**request_kwargs)
+            response = _httpx_client.request(**request_kwargs)
         except httpx.RequestError:
             logger.exception("Request to Plugin Daemon Service failed")
             raise PluginDaemonInnerError(code=-500, message="Request to Plugin Daemon Service failed")
@@ -171,7 +177,7 @@ class BasePluginClient:
             stream_kwargs["content"] = prepared_data
 
         try:
-            with httpx.stream(**stream_kwargs) as response:
+            with _httpx_client.stream(**stream_kwargs) as response:
                 for raw_line in response.iter_lines():
                     if not raw_line:
                         continue