图片网址：data:image/png;base64 (KineticJS)

Question

当使用 KineticJS 到 generate an image of the canvas 时，函数 stage.toDataURL() 给了我一个以 data:image/png;base64 开头的 URL，后跟一个很长的字符串！

问题： URL 是如何工作的？它不包含网络服务器地址，它实际上是从任何地方检索图像吗？

我想将此生成的图像保存到我的网络服务器，将这个非常长的字符串与POST 发送到我的服务器并让服务器curl 这个url 是最佳实践吗？

网址

data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAkIAAADICAYAAAAEE46XAAALwElEQVR4Xu3ZUW7dVgwE0GRD3f86uqEWBVLARlUIxBXEeZmTb8uPPEMbE/nnD/8IECBAgAABAqUCP0v3tjYBAgQIECBA4Ici5AgIECBAgACBWgFFqDZ6ixMgQIAAAQKKkBsgQIAAAQIEagUUodroLU6AAAECBAgoQm6AAAECBAgQqBVQhGqjtzgBAgQIECCgCLkBAgQIECBAoFZAEaqN3uIECBAgQICAIuQGCBAgQIAAgVoBRag2eosTIECAAAECipAbIECAAAECBGoFFKHa6C1OgAABAgQIKEJugAABAgQIEKgVUIRqo7c4AQIECBAgoAi5AQIECBAgQKBWQBGqjd7iBAgQIECAgCLkBggQIECAAIFaAUWoNnqLEyBAgAABAoqQGyBAgAABAgRqBRSh2ugtToAAAQIECChCboAAAQIECBCoFVCEaqO3OAECBAgQIKAIuQECBAgQIECgVkARqo3e4gQIECBAgIAi5AYIECBAgACBWgFFqDZ6ixMgQIAAAQKKkBsgQIAAAQIEagUUodroLU6AAAECBAgoQm6AAAECBAgQqBVQhGqjtzgBAgQIECCgCLkBAgQIECBAoFZAEaqN3uIECBAgQICAIuQGCBAgQIAAgVoBRag2eosTIECAAAECipAbIECAAAECBGoFFKHa6C1OgAABAgQIKEJugAABAgQIEKgVUIRqo7c4AQIECBAgoAi5AQIECBAgQKBWQBGqjd7iBAgQIECAgCLkBggQIECAAIFaAUWoNnqLEyBAgAABAoqQGyBAgAABAgRqBRSh2ugtToAAAQIECChCboAAAQIECBCoFVCEaqO3OAECBAgQIKAIuQECBAgQIECgVkARqo3e4gQIECBAgIAi5AYIECBAgACBWgFFqDZ6ixMgQIAAAQKKkBsgQIAAAQIEagUUodroLU6AAAECBAgoQm6AAAECBAgQqBVQhGqjtzgBAgQIECCgCLkBAgQIECBAoFZAEaqN3uIECBAgQICAIuQGCBAgQIAAgVoBRag2eosTIECAAAECipAbIECAAAECBGoFFKHa6C1OgAABAgQIKEJugAABAgQIEKgVUIRqo7c4AQIECBAgoAi5AQIECBAgQKBWQBGqjd7iBAgQIECAgCLkBggQIECAAIFaAUWoNnqLEyBAgAABAoqQGyBAgAABAgRqBRSh2ugtToAAAQIECChCboAAAQIECBCoFVCEaqO3OAECBAgQIKAIuQECBAgQIECgVkARqo3e4h8s8NcHz94wut+rDSnb8bcR8AP720RpkSIBRSg7bL9Xs/MxHYFvAn5gHQSBzxNQhLIz83s1Ox/TEVCE3ACBDxdQhLIDVISy8zEdAUXIDRD4cIHvRehPvWg1zz/+03sUodVAfDiBmYAf2JmXryaQIKAIJaTw7wyKUFIaZiEwFlCExmQeILAuoAitR/BlAEUoKQ2zEBgLKEJjMg8QWBdQhNYjUISSIjALgRMBRehEz7MEdgQUoR3360/1RigpDbMQGAsoQmMyDxBYF1CE1iPwRigpArMQOBFQhE70PEtgR0AR2nH3RijJ3SwEHhJQhB6C9G0IvCigCL2IfftR/jR2S+QLCCQLKELJ6ZiNwLWAIpR0GYpQUhpmITAWUITGZB4gsC6gCK1H8GUARSgpDbMQGAsoQmMyDxBYF1CE1iNQhJIiMAuBEwFF6ETPswR2BBShHffrT/VGKCkNsxAYCyhCYzIPEFgXUITWI/BGKCkCsxA4EVCETvQ8S2BHQBHacfdGKMndLAQeElCEHoL0bQi8KKAIvYh9+1H+NHZL5AsIJAsoQsnpmI3AtYAilHQZilBSGmYhMBZQhMZkHiCwLqAIrUfwZQBFKCkNsxAYCyhCYzIPEFgXUITWI1CEkiIwC4ETAUXoRM+zBHYEFKEd9+tP9UYoKQ2zEBgLKEJjMg8QWBdQhNYj8EYoKQKzEDgRUIRO9DxLYEdAEdpx90Yoyd0sBB4SUIQegvRtCLwooAi9iH37Uf40dkvkCwgkCyhCyemYjcC1gCKUdBmKUFIaZiEwFlCExmQeILAuoAitR/BlAEUoKQ2zEBgLKEJjMg8QWBdQhNYjUISSIjALgRMBRehEz7MEdgQUoR3360/1RigpDbMQGAsoQmMyDxBYF1CE1iPwRigpArMQOBFQhE70PEtgR0AR2nH3RijJ3SwEHhJQhB6C9G0IvCigCL2IfftR/jR2S+QLCCQLKELJ6ZiNwLWAIpR0GYpQUhpmITAWUITGZB4gsC6gCK1H8GUARSgpDbMQGAsoQmMyDxBYF1CE1iNQhJIiMAuBEwFF6ETPswR2BBShHffrT/VGKCkNsxAYCyhCYzIPEFgXUITWI/BGKCkCsxA4EVCETvQ8S2BHQBHacfdGKMndLAQeElCEHoL0bQi8KKAIvYh9+1H+NHZL5AsIJAsoQsnpmI3AtYAilHQZilBSGmYhMBZQhMZkHiCwLqAIrUfwZQBFKCkNsxAYCyhCYzIPEFgXUITWI1CEkiIwC4ETAUXoRM+zBHYEFKEd9+tP9UYoKQ2zEBgLKEJjMg8QWBdQhNYj8EYoKQKzEDgRUIRO9DxLYEdAEdpx90Yoyd0sBB4SUIQegvRtCLwooAi9iH37Uf40dkvkCwgkCyhCyemYjcC1gCKUdBmKUFIaZiEwFlCExmQeILAuoAitR/BlAEUoKQ2zEBgLKEJjMg8QWBdQhNYjUISSIjALgRMBRehEz7MEdgS+F6GdGXzq/wv4veo6CHyQgB/YDwrLqAR+CShC2afg92p2PqYj8E3AD6yDIPB5AopQdmZ+r2bnYzoCipAbIPDhAopQdoCKUHY+piOgCLkBAgQIECBAgMA/Av7n4g4IECBAgACBWgFFqDZ6ixMgQIAAAQKKkBsgQIAAAQIEagUUodroLU6AAAECBAgoQm6AAAECBAgQqBVQhGqjtzgBAgQIECCgCLkBAgQIECBAoFZAEaqN3uIECBAgQICAIuQGCBAgQIAAgVoBRag2eosTIECAAAECipAbIECAAAECBGoFFKHa6C1OgAABAgQIKEJugAABAgQIEKgVUIRqo7c4AQIECBAgoAi5AQIECBAgQKBWQBGqjd7iBAgQIECAgCLkBggQIECAAIFaAUWoNnqLEyBAgAABAoqQGyBAgAABAgRqBRSh2ugtToAAAQIECChCboAAAQIECBCoFVCEaqO3OAECBAgQIKAIuQECBAgQIECgVkARqo3e4gQIECBAgIAi5AYIECBAgACBWgFFqDZ6ixMgQIAAAQKKkBsgQIAAAQIEagUUodroLU6AAAECBAgoQm6AAAECBAgQqBVQhGqjtzgBAgQIECCgCLkBAgQIECBAoFZAEaqN3uIECBAgQICAIuQGCBAgQIAAgVoBRag2eosTIECAAAECipAbIECAAAECBGoFFKHa6C1OgAABAgQIKEJugAABAgQIEKgVUIRqo7c4AQIECBAgoAi5AQIECBAgQKBWQBGqjd7iBAgQIECAgCLkBggQIECAAIFaAUWoNnqLEyBAgAABAoqQGyBAgAABAgRqBRSh2ugtToAAAQIECChCboAAAQIECBCoFVCEaqO3OAECBAgQIKAIuQECBAgQIECgVkARqo3e4gQIECBAgIAi5AYIECBAgACBWgFFqDZ6ixMgQIAAAQKKkBsgQIAAAQIEagUUodroLU6AAAECBAgoQm6AAAECBAgQqBVQhGqjtzgBAgQIECCgCLkBAgQIECBAoFZAEaqN3uIECBAgQICAIuQGCBAgQIAAgVoBRag2eosTIECAAAECipAbIECAAAECBGoFFKHa6C1OgAABAgQIKEJugAABAgQIEKgVUIRqo7c4AQIECBAgoAi5AQIECBAgQKBWQBGqjd7iBAgQIECAgCLkBggQIECAAIFaAUWoNnqLEyBAgAABAoqQGyBAgAABAgRqBRSh2ugtToAAAQIECChCboAAAQIECBCoFVCEaqO3OAECBAgQIKAIuQECBAgQIECgVkARqo3e4gQIECBAgMDfiLaSyZOoJNUAAAAASUVORK5CYII=

Answer 1

我认为这是“数据 URI 方案”中的 URL。

http://en.wikipedia.org/wiki/Data_URI_scheme

他们的红点例子很好：

<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==" alt="Red dot">

如果你发布数据，base64解码，保存为.png，就是一个有效的png图片。