Axios POST请求部署后返回404错误：如何排查本地正常但服务器返回404的路由问题？

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

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!");
    }
}