Axios post某一个接口时在本地测试正常，部署到服务器时发生404错误（其他接口在服务器能正常使用）?

Question

接口：

app.post('/api/save', async (req, res) => {
    const data = req.body;
    const dynamicSchema = new mongoose.Schema({
        ...
    }, { collection: data.user });

    const DynamicModel = mongoose.model(data.user, dynamicSchema);
    try {
        const newEntry = new DynamicModel(data);
        await newEntry.save();
        res.status(200).json({ message: 'Data saved successfully' });
    } catch (error) {
        console.error('Error saving data:', error);
        res.status(500).json({ message: 'Error saving data' });
    }
});

请求方式：

async function save() {
    const data = { ... };

    try {
        const response = await axios.post('/api/save', data, {headers: {'Content-Type': 'application/json', Accept:'application/json'}});
        document.getElementById('saveStatus').textContent = response.data.message;
        alert("Data Saved!");
    } catch (error) {
        document.getElementById('saveStatus').textContent = error.response.data.message;
        alert("Save Failed!");
    }
}

本地测试时正常：

服务器测试时出现404错误：

服务器上应用由nginx反向代理到8080端口

其他接口在服务器路由正常。如何确定错误？