check 'vhost' validity in 'http raw dvr api'

[duiniuluantanqin]

check 'vhost' validity in 'http raw dvr api', for #2015

[codecov-commenter]

Codecov Report

Merging #2435 (143c186) into develop (a594678) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           develop    #2435      +/-   ##
===========================================
- Coverage    42.77%   42.77%   -0.01%     
===========================================
  Files          101      101              
  Lines        35944    35946       +2     
===========================================
  Hits         15376    15376              
- Misses       20568    20570       +2     

| Impacted Files | Coverage Δ | |'

Translated to English while maintaining the markdown structure:

'| Impacted Files | Coverage Δ | |
|---|---|---|
| trunk/src/app/srs_app_config.cpp | 66.98% <ø> (ø) | |
| trunk/src/app/srs_app_http_api.cpp | 0.00% <0.00%> (ø) | |

'

Translated to English while maintaining the markdown structure:

'| trunk/src/app/srs_app_config.cpp | 66.98% <ø> (ø) | |
| trunk/src/app/srs_app_http_api.cpp | 0.00% <0.00%> (ø) | |

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data'

Translated to English while maintaining the markdown structure:

'> Δ = absolute <relative> (impact), ø = not affected, ? = missing data

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