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diff --git a/RedfishPkg/RedfishHttpDxe/RedfishHttpOperation.h b/RedfishPkg/RedfishHttpDxe/RedfishHttpOperation.h
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+++ b/RedfishPkg/RedfishHttpDxe/RedfishHttpOperation.h
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+/** @file
+  Definitions of RedfishHttpOperation
+
+  Copyright (c) 2024, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef EDKII_REDFISH_HTTP_OPERATION_H_
+#define EDKII_REDFISH_HTTP_OPERATION_H_
+
+#include "RedfishHttpDxe.h"
+
+#define REDFISH_CONTENT_LENGTH_SIZE              80
+#define REDFISH_COMMON_HEADER_SIZE               5
+#define REDFISH_HTTP_HEADER_ODATA_VERSION_STR    "OData-Version"
+#define REDFISH_HTTP_HEADER_ODATA_VERSION_VALUE  "4.0"
+#define REDFISH_HTTP_HEADER_USER_AGENT_VALUE     "edk2redfish"
+#define REDFISH_HTTP_HEADER_CONNECTION_STR       "Connection"
+#define REDFISH_HTTP_HEADER_CONNECTION_VALUE     "Keep-Alive"
+#define REDFISH_HTTP_CONTENT_ENCODING_NONE       "None"
+#define ASCII_STR_DUPLICATE(a)  (AllocateCopyPool (AsciiStrSize ((a)), (a)))
+
+/**
+  This function free resources in Request. Request is no longer available
+  after this function returns successfully.
+
+  @param[in]  Request      HTTP request to be released.
+
+  @retval     EFI_SUCCESS     Resource is released successfully.
+  @retval     Others          Errors occur.
+
+**/
+EFI_STATUS
+ReleaseRedfishRequest (
+  IN  REDFISH_REQUEST  *Request
+  );
+
+/**
+  This function free resources in given Response.
+
+  @param[in]  Response     HTTP response to be released.
+
+  @retval     EFI_SUCCESS     Resource is released successfully.
+  @retval     Others          Errors occur.
+
+**/
+EFI_STATUS
+ReleaseRedfishResponse (
+  IN  REDFISH_RESPONSE  *Response
+  );
+
+/**
+  This function send Redfish request to Redfish service by calling
+  Rest Ex protocol.
+
+  @param[in]   Service       Pointer to Redfish service.
+  @param[in]   Uri           Uri of Redfish service.
+  @param[in]   Method        HTTP method.
+  @param[in]   Request     Request data. This is optional.
+  @param[out]  Response    Redfish response data.
+
+  @retval     EFI_SUCCESS     Request is sent and received successfully.
+  @retval     Others          Errors occur.
+
+**/
+EFI_STATUS
+HttpSendReceive (
+  IN  REDFISH_SERVICE   Service,
+  IN  EFI_STRING        Uri,
+  IN  EFI_HTTP_METHOD   Method,
+  IN  REDFISH_REQUEST   *Request  OPTIONAL,
+  OUT REDFISH_RESPONSE  *Response
+  );
+
+#endif