提供本地文件

[{"id":"c7e341a0.381cc","type":"http in","z":"3045204d.cfbae","name":"","url":"/hello-file","method":"get","swaggerDoc":"","x":110,"y":720,"wires":[["2fb1c354.d04e3c"]]},{"id":"2fb1c354.d04e3c","type":"file in","z":"3045204d.cfbae","name":"","filename":"/tmp/node-red.png","format":"","x":290,"y":720,"wires":[["c9e28681.361d78"]]},{"id":"c9e28681.361d78","type":"change","z":"3045204d.cfbae","name":"设置头信息","rules":[{"t":"set","p":"headers","pt":"msg","to":"{}","tot":"json"},{"t":"set","p":"headers.content-type","pt":"msg","to":"image/png","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":470,"y":720,"wires":[["88974243.7768c"]]},{"id":"88974243.7768c","type":"http response","z":"3045204d.cfbae","name":"","x":610,"y":720,"wires":[]}]