How do I view the HTTP response to an ActiveResource request?

Question

I am trying to debug an ActiveResource call that is not working.

What's the best way to view the HTTP response to the request ActiveResource is making?

Answer 1

Maybe the best way is to use a traffic sniffer.

(Which would totally work...except in my case the traffic I want to see is encrypted. D'oh!)

Answer 2

Or my method of getting into things when I don't know the exact internals is literally just to throw in a "debugger" statement, start up the server using "script/server --debugger" and then step through the code until I'm at the place I want, then start some inspecting right there in IRB.....that might help (hey Luke btw)

Answer 3

I like Wireshark because you can start it listening on the web browser client end (usually your development machine) and then do a page request. Then you can find the HTTP packets, right click and "Follow Conversation" to see the HTTP with headers going back and forth.

Answer 4

It's easy. Just look at the response that comes back. :)

Two options:

• You have the source file on your computer. Edit it. Put a puts response.inspect at the appropriate place. Remember to remove it.
• Ruby has open classes. Find the right method and redefine it to do exactly what you want, or use aliases and call chaining to do this. There's probably a method that returns the response -- grab it, print it, and then return it.

Here's a silly example of the latter option.

# Somewhere buried in ActiveResource:
class Network
  def get
    return get_request
  end

  def get_request
    "I'm a request!"
  end
end

# Somewhere in your source files:
class Network
  def print_request
    request = old_get_request
    puts request
    request
  end
  alias :old_get_request :get_request
  alias :get_request :print_request
end

Imagine the first class definition is in the ActiveRecord source files. The second class definition is in your application somewhere.

$ irb -r openclasses.rb 
>> Network.new.get
I'm a request!
=> "I'm a request!"

You can see that it prints it and then returns it. Neat, huh?

(And although my simple example doesn't use it since it isn't using Rails, check out alias_method_chain to combine your alias calls.)

Answer 5

This only works if you also control the server:

Follow the server log and fish out the URL that was called:

Completed in 0.26889 (3 reqs/sec) | Rendering: 0.00036 (0%) | DB: 0.02424 (9%) | 200 OK [http://localhost/notifications/summary.xml?person_id=25738]

and then open that in Firefox. If the server is truely RESTful (ie. stateless) you will get the same response as ARes did.

Answer 6

the firefox plugin live http headers (http://livehttpheaders.mozdev.org/) is great for this. Or you can use a website tool like http://www.httpviewer.net/

Answer 7

http://www.jroller.com/bokmann/entry/debugging_activerecord_web_services