HTTP Error 403: Forbidden

[gquittet]

I wanted to use your PlantUml extension (aka: https://github.com/evandrocoan/PlantUmlDiagrams)
for sublime text and I can't generate the image.

After checking the logs, I noticed that this was due to a 403 error.

PlantUmlDiagrams.diagram.plantuml.generate:103 - Failed to connect to the server: HTTP Error 403: Forbidden (http://www.plantuml.com/plantuml/) Falling back to local rendering...

I ran Wireshark, analyzed the HTTP call made and noticed that the error comes from the user agent which seems to generate a 403 on the plantuml side. So I propose to remove it.

Indeed, if it is not present the call works.

With user agent

curl --header Accept: --header "Accept-Encoding: identity" --header "Connection: close" --user-agent "Python-urllib/3.3" https://www.plantuml.com/plantuml/png/VP0zQm9148Rx-HKlMbmbrdU5Q0eXS5L88wGPTyTpOPqzT_SK_tqc5mWHGjgPv_sOsPRAkKwNIEngodX9HoopU6hmVXOaZG_uS3f95dM2ezIxY6A6gM7r64qVN1XPAq91DPNFV0ywqE_LBWOdJvF5Ayvy4p2oS8oF3ur91oXVP04kwB5is_s-RMdTu90cEBRWM1AykCXPEWAUulilsR-sFvP0ioQQIwqsTdI7tMJLrRouXgHua-iafPBjLfkP-mCfOz8YtqpVeKy3QcOjzXu3Q2lgxRMV -v

Without user agent

curl --header Accept: --header "Accept-Encoding: identity" --header "Connection: close" https://www.plantuml.com/plantuml/png/VP0zQm9148Rx-HKlMbmbrdU5Q0eXS5L88wGPTyTpOPqzT_SK_tqc5mWHGjgPv_sOsPRAkKwNIEngodX9HoopU6hmVXOaZG_uS3f95dM2ezIxY6A6gM7r64qVN1XPAq91DPNFV0ywqE_LBWOdJvF5Ayvy4p2oS8oF3ur91oXVP04kwB5is_s-RMdTu90cEBRWM1AykCXPEWAUulilsR-sFvP0ioQQIwqsTdI7tMJLrRouXgHua-iafPBjLfkP-mCfOz8YtqpVeKy3QcOjzXu3Q2lgxRMV -v

[gquittet]

I've made a pull request with a fix: #3

You just need to merge it.