Unhelpful HTTP api response from rails -

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i have ios app , passing image couple strings rails api. have started getting error rails. couldn't find info on causing error. assuming has passing larger average data package (an image) .

{ status code: 500, headers {     connection = close;     date = "fri, 15 jul 2016 20:30:01 gmt";     server = "nginx/1.4.6 (ubuntu)";     "transfer-encoding" = identity; }

should trying solve problem client (ios) or server (rails/nginx) perspective?

potentially helpful info:

the rails controller api starts 

def image_build     begin       puts "begin"

but "begin" never printed.

edit 1

some more info:

in ios these lines have output below:

print(response) print(response.description) print(response.data) print(response.request) print(response.response)

output:

success:  success:  optional(<>) optional(<nsmutableurlrequest: 0x7fa9539506a0> { url: http://www.example.com/api/image_build }) optional(<nshttpurlresponse: 0x7fa9515c9cd0> { url: http://www.example.com/api/image_build } { status code: 500, headers {     connection = close;     date = "fri, 15 jul 2016 20:30:01 gmt";     server = "nginx/1.4.6 (ubuntu)";     "transfer-encoding" = identity; } })

edit 2

i believe timing out in sense. when remove rails image upload , have ios send image on still doesnt work. if tell ios not send image, strings pass on successfully. fails when ios tries send image.

i not sure "puts" response, ideally should use log statements logger.debug or logger.info , check log. depending on rails env in, if in production log/production.log or log/development.log in development env. give more answers why getting 500 error.


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