111

routers/v1.py

@@ -59,6 +59,7 @@ async def chat_completions(chat_request: ChatCompletionRequest, request: Request
     headers = {"Content-Type": "application/json"}
     if auth_header:
         headers["Authorization"] = auth_header
+        headers["Access-Control-Allow-Origin"]= "*"
 
     print('\n\n\n将要发生的头信息')
     print(headers)

程序开发笔记.md

@@ -2,3 +2,235 @@
 
 1. 主文件为 app.py
 2. 以版本作为路由路径，将版本对应的路由放到 routers 文件夹下，routers/v1.py、routers/v2.py
+
+
+## js 实现的proxy分析：
+
+**基本参数**
+const BASE_URL = "https://generativelanguage.googleapis.com";
+const API_VERSION = "v1beta";
+
+
+使用postman
+**收到的heads信息为：**
+```json
+{
+    "accept": "*/*",
+    "accept-encoding": "gzip, br",
+    "authorization": "Bearer AIzaSyAjfpEhPQGilY6z98vSV2eTxFkTWKMtzB0",
+    "cf-connecting-ip": "207.244.245.191",
+    "cf-ipcountry": "US",
+    "cf-ray": "9159add17d31f155",
+    "cf-visitor": "{\"scheme\":\"https\"}",
+    "connection": "Keep-Alive",
+    "content-length": "211",
+    "content-type": "application/json",
+    "host": "gmn1.ainet.ltd",
+    "postman-token": "56134639-0283-484e-a3a6-5c56ed803f88",
+    "user-agent": "PostmanRuntime/7.43.0",
+    "x-forwarded-proto": "https",
+    "x-real-ip": "207.244.245.191"
+}
+```
+
+**收到的body信息为：**
+也就是 await request.json()
+```json
+{
+    "model": "gemini-2.0-flash-exp",
+    "messages": [
+        {
+            "role": "system",
+            "content": "你是一个有用的助手"
+        },
+        {
+            "role": "user",
+            "content": "你好！请介绍一下自己。"
+        }
+    ]
+}
+```
+
+**准备用来向后端发送的headers信息为：**
+```json
+{
+  "x-goog-api-client": "genai-js/0.21.0",
+  "x-goog-api-key": "your_api_key",
+  "Content-Type": "application/json"
+}
+```
+
+**准备用来向后端发送的body信息为：**
+已经通过 transformRequest 函数做了转换，转换后的数据为：
+```json
+{
+  "system_instruction": {
+    "parts": [
+      {
+        "text": "你是一个有用的助手"
+      }
+    ]
+  },
+  "contents": [
+    {
+      "role": "user",
+      "parts": [
+        {
+          "text": "你好！请介绍一下自己。"
+        }
+      ]
+    }
+  ],
+  "safetySettings": [
+    {
+      "category": "HARM_CATEGORY_HATE_SPEECH",
+      "threshold": "BLOCK_NONE"
+    },
+    {
+      "category": "HARM_CATEGORY_SEXUALLY_EXPLICIT",
+      "threshold": "BLOCK_NONE"
+    },
+    {
+      "category": "HARM_CATEGORY_DANGEROUS_CONTENT",
+      "threshold": "BLOCK_NONE"
+    },
+    {
+      "category": "HARM_CATEGORY_HARASSMENT",
+      "threshold": "BLOCK_NONE"
+    },
+    {
+      "category": "HARM_CATEGORY_CIVIC_INTEGRITY",
+      "threshold": "BLOCK_NONE"
+    }
+  ],
+  "generationConfig": {}
+}
+```
+
+**准备用来向后端发送的url为：**
+```
+https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash-exp:generateContent
+```
+
+**后端返回的headers信息为：**
+
+```json
+{
+    "alt-svc": "h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000",
+    "cf-cache-status": "DYNAMIC",
+    "cf-ray": "915a65d4b121df2f-SEA",
+    "connection": "keep-alive",
+    "content-type": "application/json; charset=UTF-8",
+    "date": "Fri, 21 Feb 2025 23:08:21 GMT",
+    "server": "cloudflare",
+    "server-timing": "gfet4t7; dur=1041",
+    "transfer-encoding": "chunked",
+    "vary": "Origin, X-Origin, Referer, accept-encoding",
+    "x-content-type-options": "nosniff",
+    "x-frame-options": "SAMEORIGIN",
+    "x-xss-protection": "0"
+}
+```
+
+**跨域处理后的headers信息为：**
+```json
+{
+    "alt-svc": "h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000",
+    "cf-cache-status": "DYNAMIC",
+    "cf-ray": "915a70414118757f-SEA",
+    "connection": "keep-alive",
+    "content-type": "application/json; charset=UTF-8",
+    "date": "Fri, 21 Feb 2025 23:15:28 GMT",
+    "server": "cloudflare",
+    "server-timing": "gfet4t7; dur=1237",
+    "transfer-encoding": "chunked",
+    "vary": "Origin, X-Origin, Referer, accept-encoding",
+    "x-content-type-options": "nosniff",
+    "x-frame-options": "SAMEORIGIN",
+    "x-xss-protection": "0"
+}
+```
+
+**后端返回的body信息为：**
+```json
+{
+  "candidates": [
+    {
+      "content": {
+        "parts": [
+          {
+            "text": "你好！我是一个大型语言模型，由 Google 训练。我的主要功能是处理和生成文本，我可以回答你的问题、提供信息、翻译语言、创作不同类型的文本内容，以及执行其他各种任务。我的知识库庞大且持续更新，但我无法访问互联网进行实时搜索。你可以把我理解成一个知识渊博且善于表达的助手。\n\n请告诉我你有什么需要我帮忙的？\n"
+          }
+        ],
+        "role": "model"
+      },
+      "finishReason": "STOP",
+      "safetyRatings": [
+        {
+          "category": "HARM_CATEGORY_HATE_SPEECH",
+          "probability": "NEGLIGIBLE"
+        },
+        {
+          "category": "HARM_CATEGORY_DANGEROUS_CONTENT",
+          "probability": "NEGLIGIBLE"
+        },
+        {
+          "category": "HARM_CATEGORY_HARASSMENT",
+          "probability": "NEGLIGIBLE"
+        },
+        {
+          "category": "HARM_CATEGORY_SEXUALLY_EXPLICIT",
+          "probability": "NEGLIGIBLE"
+        }
+      ],
+      "avgLogprobs": -0.59638162092729052
+    }
+  ],
+  "usageMetadata": {
+    "promptTokenCount": 12,
+    "candidatesTokenCount": 88,
+    "totalTokenCount": 100,
+    "promptTokensDetails": [
+      {
+        "modality": "TEXT",
+        "tokenCount": 12
+      }
+    ],
+    "candidatesTokensDetails": [
+      {
+        "modality": "TEXT",
+        "tokenCount": 88
+      }
+    ]
+  },
+  "modelVersion": "gemini-2.0-flash-exp"
+}
+
+```
+
+**转换后的后端body为（兼容openai的格式）：**
+```json
+{
+  "id": "chatcmpl-mjGHUQSKJ6gEpH48dP6kk36JPgPic",
+  "choices": [
+    {
+      "index": 0,
+      "message": {
+        "role": "assistant",
+        "content": "你好！我是一个大型语言模型，由 Google 训练。我旨在提供有用的信息和帮助，可以回答你的问题、生成文本、翻译语言、撰写不同类型的创意内容，并以信息丰富的方式回答你的问题。我还在不断学习和改进。\n\n你可以问我任何问题，或者让我完成各种任务。告诉我你需要什么，我会尽力提供帮助。\n"
+      },
+      "logprobs": null,
+      "finish_reason": "stop"
+    }
+  ],
+  "created": 1740178551,
+  "model": "gemini-2.0-flash-exp",
+  "object": "chat.completion",
+  "usage": {
+    "completion_tokens": 79,
+    "prompt_tokens": 12,
+    "total_tokens": 91
+  }
+}
+```
+