Server: clean up OAI params parsing function (ggml-org#6284)

* server: clean up oai parsing function

* fix response_format

* fix empty response_format

* minor fixes

* add TODO for logprobs

* update docs

Author: ngxson

examples/server/utils.hpp

@@ -745,8 +745,6 @@ static json oaicompat_completion_params_parse(
     llama_params["temperature"]       = json_value(body,   "temperature",       0.0);
     llama_params["top_p"]             = json_value(body,   "top_p",             1.0);
 
-    // Apply chat template to the list of messages
-    llama_params["prompt"] = format_chat(model, chat_template, body["messages"]);
 
     // Handle "stop" field
     if (body.contains("stop") && body["stop"].is_string()) {
@@ -785,12 +783,12 @@ static json oaicompat_completion_params_parse(
     }
 
     // Params supported by OAI but unsupported by llama.cpp
-    static const std::vector<std::string> unsupported_params { "tools", "tool_choice" };
-    for (auto & param : unsupported_params) {
-        if (body.contains(param)) {
-            throw std::runtime_error("Unsupported param: " + param);
-        }
-    }
+    // static const std::vector<std::string> unsupported_params { "tools", "tool_choice" };
+    // for (auto & param : unsupported_params) {
+    //     if (body.contains(param)) {
+    //         throw std::runtime_error("Unsupported param: " + param);
+    //     }
+    // }
 
     // Copy remaining properties to llama_params
     // This allows user to use llama.cpp-specific params like "mirostat", "tfs_z",... via OAI endpoint.