流响应接收的chunk与postman接收到的不一样 #2384
Labels
h: need more info
Further information is requested
h: need triage
This issue needs to be categorized
s: bug
Something isn't working
Comments
|
请提供最小可运行复现代码，而不是项目里的部分代码。 |
已重新编辑 |
|
@AlexV525 ==================================================== 针对您的问题，以下是解决方案： 问题1：Chunk合并问题这是由于 SSE 协议的数据帧分割方式决定的，Dio 的流式接收是按 TCP 包粒度返回的（不能保证和 SSE 的数据帧完全对应），需要手动处理数据分割。解决方案： StringBuffer buffer = StringBuffer(); // 新增缓冲区
await for (List<int> chunk in stream) {
String chunkString = utf8.decode(chunk);
buffer.write(chunkString);
// 按 SSE 协议分割数据帧（两个换行符）
while (true) {
int splitIndex = buffer.toString().indexOf('\n\n');
if (splitIndex == -1) break;
String frame = buffer.toString().substring(0, splitIndex);
buffer = StringBuffer(buffer.toString().substring(splitIndex + 2));
// 处理单个数据帧
processFrame(frame);
}
}
void processFrame(String frame) {
if (frame.isEmpty) return;
print("---frame start---");
print(frame);
print("---frame end---");
}问题2：去除 data: 前缀在分割出单个数据帧后，可以这样处理： void processFrame(String frame) {
if (frame.startsWith('data: ')) {
String jsonStr = frame.substring(6); // 去掉 data: 前缀
if (jsonStr.trim() == '[DONE]') return;
try {
Map<String, dynamic> json = jsonDecode(jsonStr);
String content = json['choices'][0]['delta']['content'] ?? '';
print('收到内容: $content');
} catch (e) {
print('JSON 解析失败: $e');
}
}
}完整优化代码void test() async {
Dio dio = Dio();
final response = await dio.request(
"https://dashscope.aliyuncs.com/compatible-mode/v1/chat/completions",
options: Options(
method: "POST",
responseType: ResponseType.stream,
headers: {
"Content-Type": "application/json",
"Authorization": "Bearer xxx",
},
),
data: {
"stream": true,
"model": "deepseek-v3",
"messages": [
{"role": "user", "content": "您好"}
],
},
);
final stream = (response.data as ResponseBody).stream;
StringBuffer buffer = StringBuffer();
await for (List<int> chunk in stream) {
String chunkString = utf8.decode(chunk);
buffer.write(chunkString);
while (true) {
int splitIndex = buffer.toString().indexOf('\n\n');
if (splitIndex == -1) break;
String frame = buffer.toString().substring(0, splitIndex);
buffer = StringBuffer(buffer.toString().substring(splitIndex + 2));
if (frame.startsWith('data: ')) {
String jsonStr = frame.substring(6);
if (jsonStr.trim() == '[DONE]') continue;
try {
Map<String, dynamic> json = jsonDecode(jsonStr);
String content = json['choices'][0]['delta']['content'] ?? '';
if (content.isNotEmpty) {
print('实时更新: $content');
}
} catch (e) {
print('解析异常: $e | 原始数据: $jsonStr');
}
}
}
}
}关键点说明
这个方案可以保证：
Postman 和代码表现差异的原因是：Postman 的 SSE 实现会自动处理数据帧分割，而 Dio 的流式请求需要手动实现这一逻辑。 ==================================================== |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Package
dio
Version
5.8.0+1
Operating-System
Android
Adapter
Default Dio
Output of
flutter doctor -vDart Version
3.6.0
Steps to Reproduce
我使用阿里云百炼的Deepseek V3 api，使用dio进行流式接收。
dio代码：
注意 Bearer xxx 改成自己的
输出形式：
Expected Result
以postman为准
Actual Result
两个问题：
2.如何才能直接接收chuck内数据，而不带“data:”前缀？
附图：
dio
postman
The text was updated successfully, but these errors were encountered: