perl:用于返回“图像数据uri”的正确“内容类型”格式 [英] perl: correct `content type` formatting for returning `image data uri`
问题描述
我在 angularjs
中有一个模板,期望通过<$调用的服务器调用返回的 image data uri
模板 img
元素的c $ c> src 属性:
I have a template in angularjs
expecting the image data uri
returned by a server call invoked through the src
attribute of the img
element of the template:
<img width="200px" height="200px" src="http://localhost:3000/returnimage" />
在服务器端,用 Perl
编写与 Dancer
我有:
On the server side, written in Perl
with Dancer
I have:
any ['get', 'post'] => '/returnimage' => sub {
content_type 'image/jpeg;base64;';
'data:image/jpeg;base64,/9j/4gIcSUNDX1B....N5f2hqE//Z';
};
模板渲染的结果是损坏的图像标签:
但调用已执行:
The result on template render is a broken image tag: But the call is executed:
网络响应和预览不可用。但是,如果我直接从浏览器调用 http:// localhost:3000 / returnimage
,它们确实包含完整的 image数据uri
作为'data:image / jpeg; base64,/ 9j / 4gIcSUNDX1B .... N5f2hqE // Z'。尽管会出现黑色图像,并且在检查时会显示黑色图像:
The network response and preview are unavailable. But if I call http://localhost:3000/returnimage
directly from the browser they do contain the complete image data uri
as 'data:image/jpeg;base64,/9j/4gIcSUNDX1B....N5f2hqE//Z'. ALthough a black image shows up and when inspected:
关于问题/修复的任何想法吗?
Any ideas on problem/fix ?
推荐答案
Perl子例程:
my $photo = '/9j/4gIcSUNDX....oqOU1MzEFUa8x2MJf5JUjFV3llWW3UVscTLNhd93KFWQUrqHn/ABEc2CfmIASx0nMWLiN5f2hqE//Z';
my $decoded= MIME::Base64::decode_base64($photo);
content_type 'image/jpeg';
$decoded;
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