Frustrating 500's on a post

[Jason Rainbird]

Hello,

I'm new to this, so please bear with me.

I'm getting a pesky 500 call on a post from my gatling script that works fine when I use a normal rest client on my machine. Can any of you spot the issue? I appreciate that this is a vague question, but any help you can provide would be appreciated.

Here's an edited version of my script...

 val httpConf = http
    .noProxyFor("localhost")
    .acceptHeader("*/*")
    .acceptCharsetHeader("ISO-8859-1,utf-8;q=0.7,*;q=0.3")
    .acceptLanguageHeader("en-GB,en-US;q=0.8,en;q=0.6")
    .acceptEncodingHeader("gzip,deflate,sdch")
    .userAgentHeader("Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.153 Safari/537.36")
    .disableCaching
    .disableWarmUp

  val scn = scenario("Web Service API Test").during(1000 milliseconds) {
 exec(http("POST test")
   .post("URL REMOVED FOR PRIVACY")
   .body(StringBody("""{"params" :[ { "id": "31675801", "paramType": "INPUT", "name": "Input - Input DataId", "type": "int", "value": "240007", "unit": "", "values": "" }, { "id": "31675803", "paramType": "PARAM", "name": "Input - Invert", "type": "bool", "value": 0, "values": ""}"""))
   .check(status.is(200)))
   }
  
  setUp(scn.inject(atOnceUsers(1)).protocols(httpConf))

Easy isn't it?

Logback gives me the following output...

Request:
POST test: KO status.is(200), but actually found 500
=========================
Session:
Session(Web Service API Test,1781151826160433670-0,Map(728cd795-f875-47ab-b8f7-839fe3d42536 -> 3, timestamp.728cd795-f875-47ab-b8f7-839fe3d42536 -> 1404985727356, gatling.http.cookies -> CookieJar(Map())),1404985727353,46,KO,List(ExitASAPLoopBlock(728cd795-f875-47ab-b8f7-839fe3d42536,<function1>,Actor[akka://GatlingSystem/user/$d/$a#59091219])))
=========================
HTTP request:
POST URL REMOVED FOR PRIVACY
headers=
Accept: [*/*]
Accept-Charset: [ISO-8859-1,utf-8;q=0.7,*;q=0.3]
Accept-Language: [en-GB,en-US;q=0.8,en;q=0.6]
Accept-Encoding: [gzip,deflate,sdch]
User-Agent: [Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.153 Safari/537.36]
stringData={"params" :[ { "id": "31675801", "paramType": "INPUT", "name": "Input - Input DataId", "type": "int", "value": "240007", "unit": "", "values": "" }, { "id": "31675803", "paramType": "PARAM", "name": "Input - Invert", "type": "bool", "value": 0, "values": ""}
=========================
HTTP response:
status=
500 Internal Server Error
headers=
Date: [Thu, 10 Jul 2014 09:48:47 GMT]
Server: [Apache/2.2.15 (CentOS)]
X-Powered-By: [PHP/5.5.13]
Vary: [Accept-Encoding]
Connection: [close]
Content-Type: [application/json]

Any ideas?

Jason

[Stéphane Landelle]

You probably lack some request headers, like Content-Type, so that the server knows which kind of payload to expect?

Server logs would probably tell you.

[Jason Rainbird]

I had wondered that too. On REST Console (a Chrome extension), the request headers are...

1. Accept: */*
2. Connection: keep-alive
3. Content-Type: application/xml
4. Origin: chrome-extension: //rest-console-id

1. User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.153 Safari/537.36

 

...and that's all. Call you see anything in that list that isn't supported in httpConf?

[Stéphane Landelle]

REST Console sends Content-Type: application/xml for a JSON payload, really???

But then, yes, this Content-Type header is missing.

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[Jason Rainbird]

I guess REST Console defaults to application/xml.

...and now the embarrassing question. Can you recommend the best way of setting the contentType in my example?

The example .headers() function on exec I found gives me compilation errors

"value headers is not a member of io.gatling.http.request.builder.Http"

Sorry for the probably obvious question.

[Stéphane Landelle]

http("POST test")
   .post("URL REMOVED FOR PRIVACY")

   .header("Content-Type", "application/json")

   . body....

[Jason Rainbird]

Excellent, thank you. The header is now set, but I still get 500's.

I had another idea. The Chrome client gives me 500's if I pass an empty body. Does the body set up code look ok to you?

exec(http("POST test")
   .post(VALID DEFINED URL HERE)
   .header("Content-Type", "application/xml")
   .body(StringBody("""{"params" :[ { "id": "31675801", "paramType": "INPUT", "name": "Input - Input DataId", "type": "int", "value": "240007", "unit": "", "values": "" }, { "id": "31675803", "paramType": "PARAM", "name": "Input - Invert", "type": "bool", "value": 0, "values": ""}""")).asJSON
   .check(status.is(200)))
   }

Logback shows it as...

stringData={"params" :[ { "id": "31675801", "paramType": "INPUT", "name": "Input - Input DataId", "type": "int", "value": "240007", "unit": "", "values": "" }, { "id": "31675803", "paramType": "PARAM", "name": "Input - Invert", "type": "bool", "value": 0, "values": ""}

...rather than something that explicitly says body.

[Stéphane Landelle]

I missed the fact you had ".asJSON", that does exactly the same thing as .header("Content-Type", "application/xml") (so you can remove it), sorry.

Now, I realize what your problem is: your JSON payload is broken!

You don't close the "params" array, there's a ] missing at the very end. 

--

[Jason Rainbird]

Ha! Sometimes it is the least of quirks that causes the greatest strife! It is now working like a charm.

Thank you for your help and your patience.

[Stéphane Landelle]

You're welcome.

Have fun!

2014-07-10 13:39 GMT+02:00 Jason Rainbird <mrjason...@gmail.com>:

Ha! Sometimes it is the least of quirks that causes the greatest strife! It is now working like a charm.

Thank you for your help and your patience.

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