Function perform

common/script/httpcall.cpp:148–226

namespace Http {
    Response perform(const Request& req)
    {
        Response res;

        FILE* upload    = nullptr;
        long uploadSize = 0;
        if (req.uploadPath) {
            upload = fopen(req.uploadPath, "rb");
            if (!upload) {
                res.result = Result::FileError;
                return res;
            }
            fseek(upload, 0, SEEK_END);
            uploadSize = ftell(upload);
            rewind(upload);
            if (uploadSize < 0) {
                fclose(upload);
                res.result = Result::FileError;
                return res;
            }
        }

        CURL* curl = curlReady() ? curl_easy_init() : nullptr;
        if (!curl) {
            if (upload) {
                fclose(upload);
            }
            res.result = Result::Unavailable;
            return res;
        }

        struct curl_slist* hl = headerSlist(req.headers);
        UploadProgress prog;
        applyCommonOptions(curl, req, &res.body, req.captureHeaders ? &res.headers : nullptr);
        if (req.method && req.method[0]) {
            curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, req.method); // GET/POST/PUT/PATCH/DELETE
        }
        if (hl) {
            curl_easy_setopt(curl, CURLOPT_HTTPHEADER, hl);
        }
        if (upload) {
            curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L); // streamed request body
            curl_easy_setopt(curl, CURLOPT_READDATA, upload);
            curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE, (curl_off_t)uploadSize);
            curl_easy_setopt(curl, CURLOPT_XFERINFOFUNCTION, uploadProgress);
            curl_easy_setopt(curl, CURLOPT_XFERINFODATA, &prog);
        }
        else {
            if (req.body && req.bodySize > 0) {
                curl_easy_setopt(curl, CURLOPT_POSTFIELDS, req.body);
                curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, req.bodySize);
            }
            curl_easy_setopt(curl, CURLOPT_XFERINFOFUNCTION, abortOnScriptCancel);
        }

        const CURLcode code = curl_easy_perform(curl);
        if (code == CURLE_OK) {
            curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &res.httpStatus);