[exim] Rspamd-Proxy error with exim

### Classification (Please choose *one* option):

* [] Crash/Hang/Data loss
* [ ] WebUI/Usability
* [ ] Serious bug
* [x] Other bug
* [ ] Feature
* [ ] Enhancement

### Reproducibility (Please choose *one* option):

* [X] Always
* [ ] Sometimes
* [ ] Rarely
* [ ] Unable
* [ ] I didn’t try
* [ ] Not applicable

### Rspamd version:

Rspamd daemon version 1.7.5

### Operation system, CPU, memory and environment:

CentOS Linux release 7.4.1708 (Core) x86_64

Cloud Hosting with 2 cores

2 Gb RAM

### Description (Please provide a descriptive summary of the issue):

rspamd-proxy doesn't work with Exim v4.87. Connection works etc but exim can't parse the response.

### Compile errors (if any):

### Steps to reproduce:

worker-proxy.inc

milter = no;
bind_socket = *:11332;
upstream "scan" {
        default = yes; # Self-scan upstreams are always default
        self_scan = yes; # Enable self-scan
        hosts = "1.2.3.4:11333";
}

exim configure

spamd_address = 1.2.3.4 11332 variant=rspamd

### Expected results:

Should work via proxy.

### Actual results:

exim log:

2018-06-13 13:45:23 1fT8te-0004kn-Pw spam acl condition: cannot parse spamd [1.2.3.4]:11332, output: 0
2018-06-13 13:45:23 1fT8te-0004kn-Pw spam acl condition: cannot parse spamd [1.2.3.4]:11332, output: 0
2018-06-13 13:45:23 1fT8te-0004kn-Pw spam acl condition: cannot parse spamd [1.2.3.4]:11332, output: 0
2018-06-13 13:45:23 1fT8te-0004kn-Pw spam acl condition: cannot parse spamd [1.2.3.4]:11332, output: 0
2018-06-13 13:45:23 1fT8te-0004kn-Pw spam acl condition: cannot parse spamd [1.2.3.4]:11332, output: 0


### Debugging information (see details [here](https://rspamd.com/doc/faq.html#how-to-figure-out-why-rspamd-process-crashed)):

### Configuration:

### Additional information:

I try using this exim versions

Exim version 4.87_1 #2 built 09-Jan-2017 13:55:10

Exim version 4.90_1 #8 built 17-Apr-2018 09:43:34


More information see this report https://github.com/vstakhov/rspamd/issues/2289

[https://avatars2.githubusercontent.com/u/35730688?s=400&v=4]<https://github.com/vstakhov/rspamd/issues/2289>

Rspamd-Proxy error with exim · Issue #2289 · vstakhov/rspamd<https://github.com/vstakhov/rspamd/issues/2289>
github.com
Classification (Please choose one option): [] Crash/Hang/Data loss WebUI/Usability Serious bug Other bug Feature Enhancement Reproducibility (Please choose one option): Always Sometimes ...