Flow images on subsequent (chaining) requests

[moono]

Problem to solve

Hi, I would like to test APIs with hurl. My API expects inputs be multipart-formdata, while responses image as output in bytes.

Lets say I have two APIs,

• API a

POST http://{{host}}:{{port}}/api/a
[MultipartFormData]
image: file,input_image.png;
canny: {"low": 100, "high": 200}

HTTP 200

• API b

POST http://{{host}}:{{port}}/api/b
[MultipartFormData]
image: file,output_a.png;
resize: {"width": 512, "height": 512}

HTTP 200

If I run both requests separately, it work perfectly fine. (using --output option on command line to save first response's output as image file and then use that image file as input to second request)

But I want to use output of first request to be input of second request --> chaining request.
I tried capturing first response as bytes and use that variable to second request with no lock.

# below fails ...

# step 01
POST http://{{host}}:{{port}}/api/a
[MultipartFormData]
image: file,input_image.png;
canny: {"low": 100, "high": 200}

HTTP 200
[Captures]
step_01_out: bytes

# step 02
POST http://{{host}}:{{port}}/api/b
[MultipartFormData]
image: {{step_01_out}}
resize: {"width": 512, "height": 512}

HTTP 200

Error message

test.hurl: Running [1/1]
error: Unrenderable variable
  --> step_01.hurl:18:18
   |
18 | image: {{step_01_out}}
   |          ^^^^^^^^^^^ variable <step_01_out> with value hex, 89504e470d0a1a ... 426082; can not be rendered
   |

test.hurl: Failure (1 request(s) in 5420 ms)
--------------------------------------------------------------------------------
Executed files:  1
Succeeded files: 0 (0.0%)
Failed files:    1 (100.0%)
Duration:        5421 ms

So it would be nice if it can send bytes between chaining requests

or if this use case already possible, please point me to right direction...

Proposal

[Capture] the output bytes as input to next request

Additional context and resources

• N/A

Tasks to complete

• ...

[jcamiel]

Hi @moono

With #1326 we're going to add the possibility of write a specific response to file. This will be possible per request thanks to Options:

# step 01
POST http://{{host}}:{{port}}/api/a
[Options]
output: output_image.png
[MultipartFormData]
image: file,input_image.png;
canny: {"low": 100, "high": 200}
HTTP 200

# step 02
POST http://{{host}}:{{port}}/api/b
[MultipartFormData]
image: file,output_image.png
resize: {"width": 512, "height": 512}

This may not be the more optimal solution for your use case (there will be a temporary write on disk) but it can solves it.

I'm working on it, I just have some preliminary work to do before. You can subscribe to #1326 notifications to get the advancement on it!

[moono]

oh. Thank you so much~~!!
I'll subscribe the issue for later use. 😀

[jcamiel]

Fixed by #2216