Fix issue with FluentBuilder

[StefH]

No description provided.

[codecov]

Codecov Report

Merging #628 (fa30fbd) into master (799ea2d) will increase coverage by 75.56%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master     #628       +/-   ##
===========================================
+ Coverage        0   75.56%   +75.56%     
===========================================
  Files           0      124      +124     
  Lines           0     5586     +5586     
  Branches        0      585      +585     
===========================================
+ Hits            0     4221     +4221     
- Misses          0     1183     +1183     
- Partials        0      182      +182     

Impacted Files	Coverage Δ
...eMock.Net/Settings/WireMockServerSettingsParser.cs	0.00% <0.00%> (ø)
...et/Matchers/Request/RequestMessageHeaderMatcher.cs	94.11% <0.00%> (ø)
src/WireMock.Net/Server/WireMockServer.Admin.cs	55.66% <0.00%> (ø)
src/WireMock.Net/ResponseBuilders/Response.cs	94.19% <0.00%> (ø)
src/WireMock.Net/Util/UrlUtils.cs	100.00% <0.00%> (ø)
src/WireMock.Net/Matchers/RegexMatcher.cs	86.95% <0.00%> (ø)
...rc/WireMock.Net/Handlers/LocalFileSystemHandler.cs	70.96% <0.00%> (ø)
src/WireMock.Net/Util/DictionaryExtensions.cs	100.00% <0.00%> (ø)
...et/ResponseProviders/ProxyAsyncResponseProvider.cs	100.00% <0.00%> (ø)
src/WireMock.Net/Exceptions/WireMockException.cs	0.00% <0.00%> (ø)
... and 114 more

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