(you don't have to strictly follow this form)

It seems that CH doesn't support  `FORMAT CustomSeparated` with http request
https://github.com/ClickHouse/ClickHouse/issues/12744#issuecomment-663738562

When I make a request with `format_custom_field_delimiter='^'`, I got an error
```
Code: 49, e.displayText() = DB::Exception: There is no checkpoint (version 20.1.2.4 (official build)) 
```
Bash script:
```
#!/bin/bash

find . -type f -name 'j.log' | while read f; do
  curl "http://localhost:8123
/?query=INSERT%20INTO%20mydb%20FORMAT%20CustomSeparated%20SETTINGS%20format_custom_escaping_rule%3D%27CSV%27%2C%20format_custom_field_delimiter%20%3D%20%27%5E%27" --data-binary "@${f}"
done
```
But all is OK, when I do it with client:
```
cat j.log |clickhouse-client  -q "INSERT into mydb FORMAT CustomSeparated SETTINGS format_custom_escaping_rule='CSV', format_custom_field_delimiter = '^'"
```


**How to reproduce**
* Which ClickHouse server version to use
 version 20.13.1.1 and github build `commit 6e34a0b71efc0e5af1cfb05b77a5e7b2568a2e49`
* Which interface to use, if matters
* Non-default settings, if any
* `CREATE TABLE` statements for all tables involved
```
CREATE TABLE mydb
(
	datetime  String,
	d1 String,
	d2 String
)
engine=MergeTree()
ORDER BY d1
SETTINGS index_granularity = 8192;
```
* Sample data for all these tables, use [clickhouse-obfuscator](https://github.com/ClickHouse/ClickHouse/blob/master/programs/obfuscator/Obfuscator.cpp#L42-L80) if necessary

j.log:
```
2021-Jan^d1^d2
```

* Queries to run that lead to unexpected result

**Expected behavior**
A clear and concise description of what you expected to happen.

**Error message and/or stacktrace**
If applicable, add screenshots to help explain your problem.

**Additional context**
Add any other context about the problem here.

};
            auto exception_callback = [elem, &context, ast,
                 log_queries,
                 log_queries_min_type = settings.log_queries_min_type,
                 log_queries_min_query_duration_ms = settings.log_queries_min_query_duration_ms.totalMilliseconds(),
                 quota(quota), status_info_to_query_log] () mutable
            {
                if (quota)
                    quota->used(Quota::ERRORS, 1,  false);
                elem.type = QueryLogElementType::EXCEPTION_WHILE_PROCESSING;
                
                
                const auto time_now = std::chrono::system_clock::now();
                elem.event_time = time_in_seconds(time_now);
                elem.event_time_microseconds = time_in_microseconds(time_now);
                elem.query_duration_ms = 1000 * (elem.event_time - elem.query_start_time);
                elem.exception_code = getCurrentExceptionCode();
                elem.exception = getCurrentExceptionMessage(false);
                QueryStatus * process_list_elem = context.getProcessListElement();
                const Settings & current_settings = context.getSettingsRef();
                
                CurrentThread::finalizePerformanceCounters();
                if (process_list_elem)
                {
                    QueryStatusInfo info = process_list_elem->getInfo(true, current_settings.log_profile_events, false);
                    status_info_to_query_log(elem, info, ast);
                }
                if (current_settings.calculate_text_stack_trace)
                    setExceptionStackTrace(elem);
                logException(context, elem);