[英]How to use Chrome's declarativeWebRequest for changing http response headers
I'm trying to write a simple Chrome extension, which replaces the Content-Type
header in http response using declarativeWebRequest (currently in beta; I'm using 25.0.1364.0). 我正在尝试编写一个简单的Chrome扩展程序,它使用declarativeWebRequest (当前为Beta;我使用的是25.0.1364.0)替换http响应中的Content-Type
标头。
The code is based on Catifier example, where I changed the registerRules
method: 该代码基于Catifier示例,其中我更改了registerRules
方法:
var RequestMatcher = chrome.declarativeWebRequest.RequestMatcher;
var RemoveResponseHeader = chrome.declarativeWebRequest.RemoveResponseHeader;
var AddResponseHeader = chrome.declarativeWebRequest.AddResponseHeader;
function registerRules() {
var changeRule = {
priority: 100,
conditions: [
// If any of these conditions is fulfilled, the actions are executed.
new RequestMatcher({
contentType: ['audio/mpeg']
}),
],
actions: [
new RemoveResponseHeader({name: 'Content-Type'}),
new AddResponseHeader({name: 'Content-Type', value: 'application/octet-stream'}),
new AddResponseHeader({name: 'X-ChromeExt-Content-Type', value: 'trap'})
]
};
var callback = function() {
if (chrome.extension.lastError) {
console.error('Error adding rules: ' + chrome.extension.lastError);
} else {
console.info('Rules successfully installed');
chrome.declarativeWebRequest.onRequest.getRules(null,
function(rules) {
console.info('Now the following rules are registered: ' +
JSON.stringify(rules, null, 2));
});
}
};
chrome.declarativeWebRequest.onRequest.addRules(
[changeRule], callback);
}
It works ok in the sense, that the rules are registered, and I got the following feedback from the browser console: 从某种意义上说,规则已注册正常,并且从浏览器控制台获得了以下反馈:
Now the following rules are registered: [
{
"actions": [
{
"instanceType": "declarativeWebRequest.RemoveResponseHeader",
"name": "Content-Type"
},
{
"instanceType": "declarativeWebRequest.AddResponseHeader",
"name": "Content-Type",
"value": "application/octet-stream"
},
{
"instanceType": "declarativeWebRequest.AddResponseHeader",
"name": "X-ChromeExt-Content-Type",
"value": "trap"
}
],
"conditions": [
{
"contentType": [
"audio/mpeg"
],
"instanceType": "declarativeWebRequest.RequestMatcher"
}
],
"id": "_0_",
"priority": 100
}
]
The problem is that the code does not actually produce any effect, that is http response headers remain unchanged. 问题在于该代码实际上不会产生任何效果,即http响应标头保持不变。 I'm not sure if this relates to a (still unfixed) bug in Chrome not displaying altered headers. 我不确定这是否与Chrome中的(仍未修复 ) 错误不显示更改后的标头有关。 But anyway, I have the following questions: 但是无论如何,我有以下问题:
1) Is the abovementioned RequestMatcher
applied to contentType
correctly or should I use a matcher for responseHeaders
instead (with somehow pointed out Content-Type
)? 1)是否将上述RequestMatcher
正确地应用于contentType
,还是应该对responseHeaders
使用匹配器(以某种方式指出Content-Type
)?
2) If RequestMatcher
should be applied to responseHeaders
, what is the syntax for such a rule? 2)如果应将RequestMatcher
应用于responseHeaders
,该规则的语法是什么?
new RequestMatcher({
responseHeaders: // what to place here to match a value in a specific header line?
// or possibly responseHeaders['Content-Type']: ...?
})
3) How can one debug a rule execution? 3)如何调试规则执行? I mean I'd like to trace and analyze how conditions are processed, and actions executed. 我的意思是我想跟踪和分析条件的处理方式和执行的动作。 Without this using declarativeWebRequest
would be a puzzle, imho. 没有declarativeWebRequest
使用, declarativeWebRequest
将是一个难题,恕我直言。
Thanks in advance. 提前致谢。
1) I tried the following code (which is almost the same as yours, except that it modifies the content type from text/html to text/plain) 1)我尝试了以下代码(除了将内容类型从text / html修改为text / plain之外,它与您的代码几乎相同)
chrome.declarativeWebRequest.onRequest.addRules([{
priority: 100,
conditions: [
// If any of these conditions is fulfilled, the actions are executed.
new chrome.declarativeWebRequest.RequestMatcher({
contentType: ['text/html']
}),
],
actions: [
new chrome.declarativeWebRequest.RemoveResponseHeader({name: 'Content-Type'}),
new chrome.declarativeWebRequest.AddResponseHeader({name: 'Content-Type', value: 'text/plain'}),
new chrome.declarativeWebRequest.AddResponseHeader({name: 'X-ChromeExt-Content-Type', value: 'trap'})
]
}])
And it worked! 而且有效! The modification is not reflected in DevTools, though. 但是,该修改未反映在DevTools中。
2) According to https://developer.chrome.com/trunk/extensions/declarativeWebRequest.html#type-HeaderFilter , you should use 2)根据https://developer.chrome.com/trunk/extensions/declarativeWebRequest.html#type-HeaderFilter ,您应该使用
new RequestMatcher({
responseHeaders: [{nameEquals: "Content-Type", valueContains: "audio/mpeg"}]
})
But it didn't work (Did I make a mistake??).
但这没有用(我犯错了吗?)。
Use valueContains instead of valueEquals since Content-Type may contain encoding. 由于Content-Type可能包含编码,因此请使用valueContains而不是valueEquals。
3) It seems impossible to do that unless you debug Chrome itself. 3)除非您调试Chrome本身,否则似乎无法做到这一点。
I tested on Chromium 25.0.1363.0 (Build 173419) 我在Chromium 25.0.1363.0(内部版本173419)上进行了测试
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.