cpp-httplib 库接口
cpp
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//客户端创建
httplib::Client::Client(const std::string& host)
void httplib::Client::set_connection_timeout(long sec, long usec)
void httplib::Client::set_read_timeout(long sec, long usec)
cpp
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//请求头
httplib::Headers::Headers()
cpp
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//POST 请求（核心）
httplib::Result httplib::Client::Post(
const std::string& path,
const httplib::Headers& headers,
const std::string& body,
const std::string& content_type
)
cpp
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//Result
// 1. 判断请求是否成功（Result 隐式转换）
httplib::Result::operator bool() const
// 2. 获取响应状态码 → **来自 Result 指向的 Response**
int httplib::Result::operator->()->status
// 3. 获取响应体字符串 → **来自 Result 指向的 Response**
std::string httplib::Result::operator->()->body
JsonCpp 库接口
cpp
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// 请求构建
Json::Value::Value()
Json::Value::Value(Json::arrayValue)
Json::Value& Json::Value::operator[](const char* key)
void Json::Value::append(const Json::Value& value)//数组 []
// 序列化
Json::StringWriterBuilder::StringWriterBuilder()
Json::Value& Json::StringWriterBuilder::operator[](const char* key)
std::string Json::writeString(Json::StreamWriterBuilder&, const Json::Value&)
// 反序列
Json::CharReaderBuilder::CharReaderBuilder()
bool Json::parseFromStream(Json::CharReaderBuilder&, std::istream&, Json::Value*, std::string*)
// 响应判断 、取值
bool Json::Value::isMember(const char*) const
bool Json::Value::isArray() const
bool Json::Value::empty() const
bool Json::Value::isObject() const
bool Json::Value::isString() const
std::string Json::Value::asString() const
📌 示例场景3
cpp
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POST https://example.com/api/chat
请求：
XML
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{
"model": "test-model",
"messages": [
{
"role": "user",
"content": "你好"
}
]
}
响应：
XML
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{
"id": "chat123",
"choices": [
{
"message": {
"role": "assistant",
"content": "你好！有什么可以帮你？"
}
}
]
}
要求完成接口：
cpp
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std::string chat(const std::string& userInput);// userInput就是用户发给模型的一句话
参考代码：
cpp
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std::string chat(const std::string& userInput)
{
//一、发送请求
//op1:创建客户端
httplib::Client client("https://example.com");
client.set_connection_timeout(10,0);
client.set_read_timeout(60,0);
//op2:构建请求
httplib::Headers headers = {
{"Content-Type","application/json"}
};
Json::Value requestBody;
requestBody["model"] = "test-model";
Json::Value messagesArray(Json::arrayValue);
Json::Value message;
message["role"]= "user";
message["content"] = userInput;
messagesArray.append(message);
requestBody["messages"] = messagesArray;
Json::StringWriterBuilder swb;
swb["indentation"] = "";
auto body = Json::writeString(swb,requestBody);
//op3:发送请求
auto result = client.Post("/api/chat",headers,body,"application/json");
if(!result)
{
bear::ERROR("chat send POST FAILED or dont recv response ERROR");
return "";
}
//二、接收响应
//op1:判断响应码
bear::INFO("chat send POST success ,response status:{}",result->status);
bear::INFO("chat send POST success ,response body:{}",result->body);
if(result->status != 200)
{
return "";
}
//op2:反序列化
Json::Value responseBody;
std::string errResponse;
Json::CharReaderBuilder crb;
std::istringstream datSrc(result->body);
auto ret = Json::parseFromStream(crb,datSrc,&responseBody,&errResponse);
if(ret == false)
{
bear::ERROR("chat recv response but parseFromStream FAILED:{}",errResponse.c_str());
return "";
}
//op3:解析响应
if(responseBody.isMember("choices") && responseBody["choices"].isArray() && !responseBody["choices"].empty())
{
auto choices = responseBody["choices"][0];
if(choices.isMember("message") && choices["message"].isObject())
{
if(choices["message"].isMember("content")&& choices["message"]["content"].isString())
{
std::string replyString = choices["message"]["content"].asString();
return replyString;
}
}
}
bear::ERROR("chat recv response but content not found");
return "";
}