[crawler] bugs encountered by wasm

Today I am going to simulate the implementation of a website wasm file , But there was
Exception：wasm: magic header not detected
This mistake .
Finally I found the reason ：

I directly copied the preview content into the file to save ,
But actually , We should click

Download here

Finally, we can save the downloaded file to pycharm In the document , That's how it became ：

Then the operation will not report an error ：