Hi.
I try to implement "sample_fetch_json_string" based on
https://github.com/cesanta/mjson.
My current test looks good but I'm struggling with the test setup.
```
git-repos/haproxy$ ./haproxy -c -f ../test-haproxy.conf
[NOTICE] 097/012132 (1043229) : haproxy version is 2.4-dev15-8daf8d-30
[NOTICE] 097/012132 (1043229) : path to executable is ./haproxy
[ALERT] 097/012132 (1043229) : parsing [../test-haproxy.conf:9] : error
detected in frontend 'fe1' while parsing
'http-request set-var(req.json)' rule : fetch method 'str' : expected ')' before
',\"kubernetes.io/serviceaccount/namespace\":\"openshift-logging\",\"kubernetes.io/serviceaccount/secret.name\":\"deployer-token-m98xh\",\"kubernetes.io/serviceaccount/service-account.name\":\"deployer\",\"kubernetes.io/serviceaccount/service-account.uid\":\"35dddefd-3b5a-11e9-947c-fa163e480910\",\"sub\":\"system:serviceaccount:openshift-logging:deployer\"})'.
[ALERT] 097/012132 (1043229) : Error(s) found in configuration file :
../test-haproxy.conf
```
That's the config.
```
defaults
mode http
timeout connect 1s
timeout client 1s
timeout server 1s
frontend fe1
bind "127.0.0.1:8080"
http-request set-var(req.json)
'str({\"iss\":\"kubernetes/serviceaccount\",\"kubernetes.io/serviceaccount/namespace\":\"openshift-logging\",\"kubernetes.io/serviceaccount/secret.name\":\"deployer-token-m98xh\",\"kubernetes.io/serviceaccount/service-account.name\":\"deployer\",\"kubernetes.io/serviceaccount/service-account.uid\":\"35dddefd-3b5a-11e9-947c-fa163e480910\",\"sub\":\"system:serviceaccount:openshift-logging:deployer\"})'
```
I have tried several combos like.
str("...")
str('...')
str(...)
I have also added more '\' in the string.
But I get always the error above.
Any Idea how to fix the error?
Regards
Alex
