How can I debug a HTTP POST in Chrome

Question

I would like to view HTTP POST data that was sent in Chrome  The data is in memory now  and I have the ability to resubmit the form  I know that if I resubmit the server will throw an error  Is there anyway I can view the data that is in Chrome s memory

User · Answer

The other people made very nice answers  but I would like to complete their work with an extra development tool  It is called Live HTTP Headers and you can install it into your Firefox  and in Chrome we have the same plug in like this   Working with it is queit easy     Using your Firefox  navigate to the website which you want to get your post request to it  In your Firefox menu Tools- Live Http Headers A new window pop ups for you  and all the http method details would be saved in this window for you  You don t need to do anything in this step  In the website  do an activity log in  submit a form  etc   Look at your plug in window  It is all recorded    Just remember you need to check the Capture

User · Answer

It has a tricky situation  If you submit a post form  then Chrome will open a new tab to send the request  It s right until now  but if it triggers an event to download file s   this tab will close immediately so that you cannot capture this request in the Dev Tool   Solution   Before submitting the post form  you need to cut off your network  which makes the request cannot send successfully so that the tab will not be closed  And then you can capture the request message in the Chrome Devtool Refreshing the new tab if necessary

User · Answer

You can use Canary version of Chrome to see request payload of POST requests

User · Answer

Go to Chrome Developer Tools  Chrome Menu -  More Tools -  Developer Tools  Choose  Network  tab Refresh the page you re on You ll get list of http queries that happened  while the network console was on  Select one of them in the left Choose  Headers  tab   Voila

User · Answer

You can filter for HTTP POST requests with the Chrome DevTools  Just do the following    Open Chrome DevTools  Cmd Opt I on Mac  Ctrl Shift I or F12 on Windows  and click on the  Network  tab Click on the  Filter  icon Enter your filter method  method POST Select the request you want to debug View the details of the request you want to debug   Screenshot    Tested with Chrome Version 53

User · Answer

Another option that may be useful is a dedicated HTTP debugging tool  There s a few available  I d suggest HTTP Toolkit  an open-source project I ve been working on  yeah  I might be biased  to solve this same problem for myself   The main difference is usability  amp  power  The Chrome dev tools are good for simple things  and I d recommend starting there  but if you re struggling to understand the information there  and you need either more explanation or more power then proper focused tools can be useful   For this case  it ll show you the full POST body you re looking for  with a friendly editor and highlighting  all powered by VS Code  so you can dig around  It ll give you the request  amp  response headers of course  but with extra info like docs from MDN  the Mozilla Developer Network  for every standard header and status code you can see    A picture is worth a thousand StackOverflow answers

[google-chrome] How can I debug a HTTP POST in Chrome?

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