How Can I Access Raw POST Data in PHP When Using multipart/form-data?

Unexpected Behavior: Raw Post Data Not Available

As stated in the PHP manual, neither php://input nor $HTTP_RAW_POST_DATA can be used to retrieve raw POST data for requests with multipart/form-data content-type. This is because php://input allows for efficient retrieval of raw data, but it only works when the content-type is not multipart/form-data.

Workaround for multipart/form-data Forms

Despite the lack of direct access to raw post data for multipart/form-data requests, a workaround exists to retrieve it:

1. Modify Apache Config: Add the following configuration to your Apache config file:

   <Location "/backend/XXX.php">
    SetEnvIf Content-Type ^(multipart/form-data)(.*) NEW_CONTENT_TYPE=multipart/form-data-alternate OLD_CONTENT_TYPE=
    RequestHeader set Content-Type %{NEW_CONTENT_TYPE}e env=NEW_CONTENT_TYPE
   </Location> 

2. Trick PHP: This modification will change the Content-Type of incoming requests to XXX.php from multipart/form-data to multipart/form-data-alternate. As a result, PHP will no longer attempt to parse the data.
3. Retrieve Raw Data: You can now access the complete raw data from php://input and parse it yourself.

Considerations:

• The workaround will result in an empty $_FILES array.
• This hack is not an official solution, but it provides a means to obtain raw data for multipart/form-data requests.
• It's always best to ensure that the partner sending the data adheres to the correct content-type to avoid such issues entirely.

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