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Level 7

How do i recreate a html request header?

I'm currently writing a Java Application that remotely controls my Roku. I found this website and used it to control my Roku. From Chromes developer tools i watched its data traffic and found the html request that controlled the Roku. The Header was this.

POST /keydown/Play HTTP/1.1
Connection: keep-alive
Content-Length: 0
Cache-Control: max-age=0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.110 Safari/537.36
Content-Type: application/x-www-form-urlencoded
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.8
I then tried to recreate this POST request within Java and it ended up looking like this:

HttpURLConnection urlConn;
URL url = new URL("html://");
urlConn = (HttpURLConnection) url.openConnection();

urlConn.setRequestProperty("Connection", "keep-alive");
urlConn.setRequestProperty("Content-Length", "0");
urlConn.setRequestProperty("Cache-Control", "max-age=0");
urlConn.setRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");
urlConn.setRequestProperty("Origin", "");
urlConn.setRequestProperty("Upgrade-Insecure-Requests", "1");
urlConn.setRequestProperty("User-Agent","Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.110 Safari/537.36");
urlConn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); 
urlConn.setRequestProperty("Referer", "");
urlConn.setRequestProperty("Accept-Encoding", "gzip, deflate");
urlConn.setRequestProperty("Accept-Language", "en-US,en;q=0.8");
I'm not 100% sure this is the correct way to recreate the request because it does not have the same effect as the the original (working). However, this may be because I changed a few minor details that may have actually be important. So my question to you is if this the correct way to recreate a request and if it is why is it not working? If not what is? Any help is appreciated
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6 Replies
Level 13

Re: How do i recreate a html request header?

I'd post this in the Developer's forum instead.
Yeah, I got some Rokus.
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Level 9

Re: How do i recreate a html request header?

Most of those properties you're setting are unnecessary. The one thing you do need that you're missing is setRequestMethod("POST"). I don't do Java, so there may be other issues with your code.

Also, instead of using Chrome Developer Tools to determine the Roku interface, why not read the documentation:
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Level 7

Re: How do i recreate a html request header?

I agree with belltown.
Java Developer
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Level 10

Re: How do i recreate a html request header?

Roku also has a bunch of free tools here -
RemoteRoku is the first on the left, Deeplinker allows you to add fields in addition to contentID and Mediatype too.
I don't think their tools allow much interaction (if any) with customizing headers in requests there, but they shouldn't be needed except for perhaps the video playback tester tool, which includes a headers tab.
As for creating a header in the channel app, use AddHeader
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Level 11

Re: How do i recreate a html request header?

If you set on using chromes developer tools, may I suggest right clicking on the data you are referring to and "copy as curl"
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Level 7

Re: How do i recreate a html request header?

HTTP is one of the core technologies behind the Web. In addition to the actual content, some important information is passed with HTTP headers for both HTTP requests and responses.

You can add your own HTTP headers to any request the application makes, whether the request is initiated by your code explicitly opening an HTTP channel, because of XMLHttpRequest activity, an <img> element in content, or even from CSS.

Also, follow as scripting like Angular js is one of the best programmings for web development

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