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third_party/cpp_httplib/README.md

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+a header-only http library from github: https://github.com/yhirose/cpp-httplib
+
+**NOTE**
+
+support online LLM REST API calling based on OpenAI protocols or local deployment such as Ollama/vLLM in VideoPipe.
+
+```
+compile test:
+g++ httplib_test.cpp -o httplib_test -O2
+
+and run:
+./httplib_test
+
+```

third_party/cpp_httplib/httplib_test.cpp

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+#include <iostream>
+#include "httplib.h"
+
+int main() {
+    /**
+     * GET html from website: http://www.videopipe.cool
+    */
+    httplib::Client get_cli("http://www.videopipe1.cool");
+    if (auto res = get_cli.Get("/index.php/bloglist/")) {
+        if (res->status == httplib::StatusCode::OK_200) {
+            std::cout << res->body << std::endl;
+        } 
+        else {
+            std::cout << res->status << std::endl;
+        }
+    } 
+    else {
+        auto err = res.error();
+        std::cout << "HTTP error: " << httplib::to_string(err) << std::endl;
+    }
+
+    /**
+     * POST data with headers to LLM service based on Ollama.
+    */
+    httplib::Client post_cli("http://192.168.77.219:11434");
+    httplib::Headers headers = {{"myheader1", "1111"}, {"myheader2", "2222"}};
+    auto payload = R"(
+    {
+        "model": "qwen2.5:7b",
+        "prompt": "为什么坐火车要给钱？",
+        "stream": false
+    }
+    )";
+    if (auto res = post_cli.Post("/api/generate", headers, payload, "application/json")) {
+        if (res->status == httplib::StatusCode::OK_200) {
+            std::cout << res->body << std::endl;
+        } 
+        else {
+            std::cout << res->body << std::endl;
+            std::cout << res->status << std::endl;
+        }
+    } 
+    else {
+        auto err = res.error();
+        std::cout << "HTTP error: " << httplib::to_string(err) << std::endl;
+    }
+}