Swimlanes.io is a free webapp for making sequence diagrams. You simply edit the text on the left and the diagram is updated in real time. You can download your sequence diagrams as images or distribute with a link.
Title: Computer Vision Vietnam: Smart Crop Client -> Computer Vision Vietnam API: Cắt ảnh thông minh note _:``` POST https://cloud.computervision.com.vn/api/v2/smartcrop/crop_image img: ảnh cần cắt ``` Client <-- Computer Vision Vietnam API: Trả về kết quả