It appears to me that a long line in the Entity object is just that - a long line. Only the display is word- wrapped. There is no issue with a line starting with a dot. If some 'upstream' software (or person) did the analogous word-wrap before the build, the object would indeed have two lines one of which might start with a period. In that case, your URL would contain a newline character right before the dot. If this does not describe the problem, please post code that builds two similar objects, one that is correct and one that is not.
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Want more info? How to link or
or How to display code and escape characters
are good places to start.