自定义响应内容

{"value":"\u7b80\u5355\u53cd\u9988\u53ea\u5305\u542b\u8d44\u6e90\u7684\u57fa\u672c\u4fe1\u606f\uff0c\u4f46\u5f88\u591a\u60c5\u51b5\u4e0b\u7528\u6237\u5e0c\u671b\u5f97\u5230\u66f4\u591a\u7684\u8d44\u6e90\u4fe1\u606f\u3002\n\n\u5728\u751f\u6210\u4e0a\u4f20\u51ed\u8bc1\u65f6\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6e\u4e0a\u4f20\u7b56\u7565 (PutPolicy)\u4e2d\u7684`ReturnBody`\u5b57\u6bb5\u6307\u5b9a\u9700\u8981\u8fd4\u56de\u7684\u4fe1\u606f\uff0c\u4f8b\u5982\u8d44\u6e90\u7684\u5927\u5c0f\u3001\u7c7b\u578b\uff0c\u56fe\u7247\u7684\u5c3a\u5bf8\u7b49\u7b49\u3002\n\n`ReturnBody`\u5b9e\u9645\u4e0a\u662f\u7528\u6237\u5b9a\u4e49\u7684\u53cd\u9988\u4fe1\u606f\u6a21\u677f\uff0c**\u5185\u5bb9\u5fc5\u987b\u7528JSON\u683c\u5f0f\u8868\u8fbe**\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a\n\n```\n{\n \"foo\": \"bar\",\n \"name\": $(fname),\n \"size\": $(fsize),\n \"type\": $(mimeType),\n \"hash\": $(etag),\n \"w\": $(imageInfo.width),\n \"h\": $(imageInfo.height),\n \"color\": $(exif.ColorSpace.val)\n}\n```\n\n\u7528\u6237\u53ef\u4ee5\u5728`ReturnBody`\u4e2d\u4f7f\u7528\u9b54\u6cd5\u53d8\u91cf\u548c\u81ea\u5b9a\u4e49\u53d8\u91cf\u3002\u79c1\u6709\u4e91\u5b58\u50a8\u4f1a\u5c06\u8fd9\u4e9b\u53d8\u91cf\u66ff\u6362\u4e3a\u5bf9\u5e94\u5b9e\u9645\u503c\uff0c\u7136\u540e\u4f5c\u4e3a\u54cd\u5e94\u5185\u5bb9\u53cd\u9988\u7ed9\u7528\u6237\uff0c\u5982\u4e0b\u6240\u793a\uff1a\n\n```\n {\n \"foo\": \"bar\",\n \"name\": \"gogopher.jpg\",\n \"size\": 214513,\n \"type\": \"image\/jpg\",\n \"hash\": \"Fh8xVqod2MQ1mocfI4S4KpRL6D98\",\n \"w\": 640,\n \"h\": 480,\n \"color\": \"sRGB\"\n }\n```\n\n**\u6ce8\u610f\uff1a**\u5982\u679c\u4e0a\u4f20\u7b56\u7565 (PutPolicy)\u4e2d\u901a\u8fc7\u8bbe\u7f6e`callbackUrl`\u5b57\u6bb5\u542f\u7528\u4e86\u56de\u8c03\uff0c`ReturnBody`\u5c06\u76f4\u63a5\u88ab\u5ffd\u7565\u3002\n\n\u5728\u56de\u8c03\u6a21\u5f0f\u4e2d\u5982\u679c\u4e5f\u60f3\u81ea\u5b9a\u4e49\u54cd\u5e94\u5185\u5bb9\uff0c\u8bf7\u5728\u751f\u6210\u4e0a\u4f20\u51ed\u8bc1\u65f6\u8bbe\u7f6e\u4e0a\u4f20\u7b56\u7565\u4e2d\u7684`callbackBody`\u5b57\u6bb5\u3002\u66f4\u591a\u5173\u4e8e\u56de\u8c03\u6a21\u5f0f\u7684\u89e3\u91ca\uff0c\u8bf7\u53c2\u8003\u56de\u8c03\u901a\u77e5 (callback)\u3002\n\n"}