curl --request PATCH \
  --url http://localhost:8000/apps/{app_name}/users/{user_id}/sessions/{session_id} \
  --header 'Content-Type: application/json' \
  --data '
{
  "stateDelta": {
    "language": "zh"
  }
}
'

import requests

url = "http://localhost:8000/apps/{app_name}/users/{user_id}/sessions/{session_id}"

payload = { "stateDelta": { "language": "zh" } }
headers = {"Content-Type": "application/json"}

response = requests.patch(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'PATCH',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({stateDelta: {language: 'zh'}})
};

fetch('http://localhost:8000/apps/{app_name}/users/{user_id}/sessions/{session_id}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "id": "<string>",
  "appName": "<string>",
  "userId": "<string>",
  "state": {},
  "events": [
    {
      "modelVersion": "<string>",
      "content": {
        "parts": [
          {
            "mediaResolution": {
              "level": "MEDIA_RESOLUTION_UNSPECIFIED",
              "numTokens": 123
            },
            "codeExecutionResult": {
              "outcome": "OUTCOME_UNSPECIFIED",
              "output": "<string>",
              "id": "<string>"
            },
            "executableCode": {
              "code": "<string>",
              "language": "LANGUAGE_UNSPECIFIED",
              "id": "<string>"
            },
            "fileData": {
              "displayName": "<string>",
              "fileUri": "<string>",
              "mimeType": "<string>"
            },
            "functionCall": {
              "id": "<string>",
              "args": {},
              "name": "<string>",
              "partialArgs": [
                {
                  "boolValue": true,
                  "jsonPath": "<string>",
                  "nullValue": "NULL_VALUE",
                  "numberValue": 123,
                  "stringValue": "<string>",
                  "willContinue": true
                }
              ],
              "willContinue": true
            },
            "functionResponse": {
              "willContinue": true,
              "scheduling": "SCHEDULING_UNSPECIFIED",
              "parts": [
                {
                  "inlineData": {
                    "mimeType": "<string>",
                    "data": "<string>",
                    "displayName": "<string>"
                  },
                  "fileData": {
                    "fileUri": "<string>",
                    "mimeType": "<string>",
                    "displayName": "<string>"
                  }
                }
              ],
              "id": "<string>",
              "name": "<string>",
              "response": {}
            },
            "inlineData": {
              "data": "<string>",
              "displayName": "<string>",
              "mimeType": "<string>"
            },
            "text": "<string>",
            "thought": true,
            "thoughtSignature": "<string>",
            "videoMetadata": {
              "endOffset": "<string>",
              "fps": 123,
              "startOffset": "<string>"
            },
            "toolCall": {
              "id": "<string>",
              "toolType": "TOOL_TYPE_UNSPECIFIED",
              "args": {}
            },
            "toolResponse": {
              "id": "<string>",
              "toolType": "TOOL_TYPE_UNSPECIFIED",
              "response": {}
            },
            "partMetadata": {}
          }
        ],
        "role": "<string>"
      },
      "groundingMetadata": {
        "imageSearchQueries": [
          "<string>"
        ],
        "groundingChunks": [
          {
            "image": {
              "sourceUri": "<string>",
              "imageUri": "<string>",
              "title": "<string>",
              "domain": "<string>"
            },
            "maps": {
              "placeAnswerSources": {
                "reviewSnippet": [
                  {
                    "authorAttribution": {
                      "displayName": "<string>",
                      "photoUri": "<string>",
                      "uri": "<string>"
                    },
                    "flagContentUri": "<string>",
                    "googleMapsUri": "<string>",
                    "relativePublishTimeDescription": "<string>",
                    "review": "<string>",
                    "reviewId": "<string>",
                    "title": "<string>"
                  }
                ],
                "flagContentUri": "<string>",
                "reviewSnippets": [
                  {
                    "authorAttribution": {
                      "displayName": "<string>",
                      "photoUri": "<string>",
                      "uri": "<string>"
                    },
                    "flagContentUri": "<string>",
                    "googleMapsUri": "<string>",
                    "relativePublishTimeDescription": "<string>",
                    "review": "<string>",
                    "reviewId": "<string>",
                    "title": "<string>"
                  }
                ]
              },
              "placeId": "<string>",
              "text": "<string>",
              "title": "<string>",
              "uri": "<string>",
              "route": {
                "distanceMeters": 123,
                "duration": "<string>",
                "encodedPolyline": "<string>"
              }
            },
            "retrievedContext": {
              "documentName": "<string>",
              "ragChunk": {
                "pageSpan": {
                  "firstPage": 123,
                  "lastPage": 123
                },
                "text": "<string>",
                "chunkId": "<string>",
                "fileId": "<string>"
              },
              "text": "<string>",
              "title": "<string>",
              "uri": "<string>",
              "customMetadata": [
                {
                  "key": "<string>",
                  "numericValue": 123,
                  "stringListValue": {
                    "values": [
                      "<string>"
                    ]
                  },
                  "stringValue": "<string>"
                }
              ],
              "fileSearchStore": "<string>",
              "pageNumber": 123,
              "mediaId": "<string>"
            },
            "web": {
              "domain": "<string>",
              "title": "<string>",
              "uri": "<string>"
            }
          }
        ],
        "groundingSupports": [
          {
            "confidenceScores": [
              123
            ],
            "groundingChunkIndices": [
              123
            ],
            "segment": {
              "startIndex": 123,
              "endIndex": 123,
              "partIndex": 123,
              "text": "<string>"
            },
            "renderedParts": [
              123
            ]
          }
        ],
        "retrievalMetadata": {
          "googleSearchDynamicRetrievalScore": 123
        },
        "searchEntryPoint": {
          "renderedContent": "<string>",
          "sdkBlob": "<string>"
        },
        "webSearchQueries": [
          "<string>"
        ],
        "googleMapsWidgetContextToken": "<string>",
        "retrievalQueries": [
          "<string>"
        ],
        "sourceFlaggingUris": [
          {
            "flagContentUri": "<string>",
            "sourceId": "<string>"
          }
        ]
      },
      "partial": true,
      "turnComplete": true,
      "turnCompleteReason": "TURN_COMPLETE_REASON_UNSPECIFIED",
      "finishReason": "FINISH_REASON_UNSPECIFIED",
      "errorCode": "<string>",
      "errorMessage": "<string>",
      "interrupted": true,
      "customMetadata": {},
      "usageMetadata": {
        "cacheTokensDetails": [
          {
            "modality": "MODALITY_UNSPECIFIED",
            "tokenCount": 123
          }
        ],
        "cachedContentTokenCount": 123,
        "candidatesTokenCount": 123,
        "candidatesTokensDetails": [
          {
            "modality": "MODALITY_UNSPECIFIED",
            "tokenCount": 123
          }
        ],
        "promptTokenCount": 123,
        "promptTokensDetails": [
          {
            "modality": "MODALITY_UNSPECIFIED",
            "tokenCount": 123
          }
        ],
        "thoughtsTokenCount": 123,
        "toolUsePromptTokenCount": 123,
        "toolUsePromptTokensDetails": [
          {
            "modality": "MODALITY_UNSPECIFIED",
            "tokenCount": 123
          }
        ],
        "totalTokenCount": 123,
        "trafficType": "TRAFFIC_TYPE_UNSPECIFIED"
      },
      "liveSessionResumptionUpdate": {
        "newHandle": "<string>",
        "resumable": true,
        "lastConsumedClientMessageIndex": 123
      },
      "liveSessionId": "<string>",
      "goAway": {
        "timeLeft": "<string>"
      },
      "inputTranscription": {
        "text": "<string>",
        "finished": true,
        "languageCode": "<string>"
      },
      "outputTranscription": {
        "text": "<string>",
        "finished": true,
        "languageCode": "<string>"
      },
      "avgLogprobs": 123,
      "logprobsResult": {
        "chosenCandidates": [
          {
            "logProbability": 123,
            "token": "<string>",
            "tokenId": 123
          }
        ],
        "topCandidates": [
          {
            "candidates": [
              {
                "logProbability": 123,
                "token": "<string>",
                "tokenId": 123
              }
            ]
          }
        ],
        "logProbabilitySum": 123
      },
      "cacheMetadata": {
        "fingerprint": "<string>",
        "contents_count": 1,
        "cache_name": "<string>",
        "expire_time": 123,
        "invocations_used": 1,
        "created_at": 123
      },
      "citationMetadata": {
        "citations": [
          {
            "endIndex": 123,
            "license": "<string>",
            "publicationDate": {
              "day": 123,
              "month": 123,
              "year": 123
            },
            "startIndex": 123,
            "title": "<string>",
            "uri": "<string>"
          }
        ]
      },
      "interactionId": "<string>",
      "invocationId": "",
      "author": "",
      "actions": {
        "skipSummarization": true,
        "stateDelta": {},
        "artifactDelta": {},
        "transferToAgent": "<string>",
        "escalate": true,
        "requestedAuthConfigs": {},
        "requestedToolConfirmations": {},
        "compaction": {
          "startTimestamp": 123,
          "endTimestamp": 123,
          "compactedContent": {
            "parts": [
              {
                "mediaResolution": {
                  "level": "MEDIA_RESOLUTION_UNSPECIFIED",
                  "numTokens": 123
                },
                "codeExecutionResult": {
                  "outcome": "OUTCOME_UNSPECIFIED",
                  "output": "<string>",
                  "id": "<string>"
                },
                "executableCode": {
                  "code": "<string>",
                  "language": "LANGUAGE_UNSPECIFIED",
                  "id": "<string>"
                },
                "fileData": {
                  "displayName": "<string>",
                  "fileUri": "<string>",
                  "mimeType": "<string>"
                },
                "functionCall": {
                  "id": "<string>",
                  "args": {},
                  "name": "<string>",
                  "partialArgs": [
                    {
                      "boolValue": true,
                      "jsonPath": "<string>",
                      "nullValue": "NULL_VALUE",
                      "numberValue": 123,
                      "stringValue": "<string>",
                      "willContinue": true
                    }
                  ],
                  "willContinue": true
                },
                "functionResponse": {
                  "willContinue": true,
                  "scheduling": "SCHEDULING_UNSPECIFIED",
                  "parts": [
                    {
                      "inlineData": {
                        "mimeType": "<string>",
                        "data": "<string>",
                        "displayName": "<string>"
                      },
                      "fileData": {
                        "fileUri": "<string>",
                        "mimeType": "<string>",
                        "displayName": "<string>"
                      }
                    }
                  ],
                  "id": "<string>",
                  "name": "<string>",
                  "response": {}
                },
                "inlineData": {
                  "data": "<string>",
                  "displayName": "<string>",
                  "mimeType": "<string>"
                },
                "text": "<string>",
                "thought": true,
                "thoughtSignature": "<string>",
                "videoMetadata": {
                  "endOffset": "<string>",
                  "fps": 123,
                  "startOffset": "<string>"
                },
                "toolCall": {
                  "id": "<string>",
                  "toolType": "TOOL_TYPE_UNSPECIFIED",
                  "args": {}
                },
                "toolResponse": {
                  "id": "<string>",
                  "toolType": "TOOL_TYPE_UNSPECIFIED",
                  "response": {}
                },
                "partMetadata": {}
              }
            ],
            "role": "<string>"
          }
        },
        "endOfAgent": true,
        "agentState": {},
        "rewindBeforeInvocationId": "<string>",
        "route": true,
        "renderUiWidgets": [
          {
            "id": "<string>",
            "provider": "<string>",
            "payload": {}
          }
        ],
        "setModelResponse": null
      },
      "output": null,
      "nodeInfo": {
        "path": "",
        "outputFor": [
          "<string>"
        ],
        "messageAsOutput": true
      },
      "longRunningToolIds": [
        "<string>"
      ],
      "branch": "<string>",
      "isolationScope": "<string>",
      "id": "",
      "timestamp": 123
    }
  ],
  "lastUpdateTime": 0
}

{
  "detail": "<string>"
}

{
  "detail": [
    {
      "loc": [
        "<string>"
      ],
      "msg": "<string>",
      "type": "<string>",
      "input": "<unknown>",
      "ctx": {}
    }
  ]
}