use repair_json fix json parse error of HTTPRequestNode (#21909)

Co-authored-by: lizb <lizb@sugon.com>

api/core/workflow/nodes/http_request/executor.py

@@ -8,6 +8,7 @@ from typing import Any, Literal
 from urllib.parse import urlencode, urlparse
 
 import httpx
+from json_repair import repair_json
 
 from configs import dify_config
 from core.file import file_manager
@@ -178,7 +179,8 @@ class Executor:
                         raise RequestBodyError("json body type should have exactly one item")
                     json_string = self.variable_pool.convert_template(data[0].value).text
                     try:
-                        json_object = json.loads(json_string, strict=False)
+                        repaired = repair_json(json_string)
+                        json_object = json.loads(repaired, strict=False)
                     except json.JSONDecodeError as e:
                         raise RequestBodyError(f"Failed to parse JSON: {json_string}") from e
                     self.json = json_object