空的$ _POST和$ _FILES，但在multipart / form-data请求上非空的php：// input，iOS AFNetworking库

Question

I am implementing a multipart request on PHP 5.4 (more specifically, using Yii Framework), where 2 of the parameters are plain text and the other one is an image file. The problem is that if I use the header Content-Type: multipart/form-data , when I do the request, I get the following message

Internal Server Error

Undefined index: myTextVar1

Using file_get_contents('php://input') to check if the server receives the parameters, I can see that all the information has arrived. But both $_POST and $_FILES arrays are empty.

If I remove the header Content-Type , request works fine, $_POST and $_FILES arrays are filled properly. I have tried this on Postman Chrome tool, AngularJS and Android, in every case happens the same.

We are using the library AFNetworking on iOS, which automatically adds the Content-Type header, and we would like to stick to it rather than trying to use another solution.

Is there any possible way to fix this on PHP or should we try to use an alternative library on iOS?

EDIT: Code of the iOS request

[sessionManager POST:path parameters:nil constructingBodyWithBlock:^(id formData) {

  [formData appendPartWithFormData:[myTextVar1 dataUsingEncoding:NSUTF8StringEncoding] name:@"myTextVar1"]; [formData appendPartWithFormData:[myTextVar2 dataUsingEncoding:NSUTF8StringEncoding] name:@"myTextVar2"]; [formData appendPartWithFileData:dataToUpload name:@"imageAnswer" fileName:@"image.jpg" mimeType:@"image/jpeg"]; } success:^(NSURLSessionDataTask *task, id responseObject) { successBlock(); } failure:^(NSURLSessionDataTask *task, NSError *error) { failureBlock(); }]; 

Answer 1

We have solved the problem on iOS by using our own implementation of the multipart POST request, with the help of NSMutableURLRequest. Still this doesn't answer why can't we use AFNetworking or place the Content-Type header on Postman, Android and AngularJS. We have a strong feeling that the issue with AFNetworking is that sends the request chunked (header transfer-encoding: chunked ). We actually send the Content-Type: multipart/form-data on our custom iOS implementation, so somehow the problem is not that header at all.

On the server side, when using Postman tool while setting Content-Type header, I can verify that data comes through php://input, but does not reach, php://stdin, $_POST and $_FILES.

We have not tried to disable chunking on Apache, but that might solve the problem too.

I leave below some related links that can be helpful for others in the future... https://serverfault.com/questions/142512/problem-with-transfer-encoding-chunked-in-apache-2-2/143965#143965

https://serverfault.com/questions/59047/apache-sending-transfer-encoding-chunked

https://bugs.php.net/bug.php?id=50210